Merge remote-tracking branch 'origin/master' into drizzle

[phpmyadmin.git] / libraries / common.lib.php

<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Misc functions used all over the scripts.
 *
 * @package phpMyAdmin
 */

/**
 * Detects which function to use for PMA_pow.
 *
 * @return string Function name.
 */
function PMA_detect_pow()
{
    if (function_exists('bcpow')) {
        // BCMath Arbitrary Precision Mathematics Function
        return 'bcpow';
    } elseif (function_exists('gmp_pow')) {
        // GMP Function
        return 'gmp_pow';
    } else {
        // PHP function
        return 'pow';
    }
}

/**
 * Exponential expression / raise number into power
 *
 * @param string $base         base to raise
 * @param string $exp          exponent to use
 * @param mixed  $use_function pow function to use, or false for auto-detect
 *
 * @return mixed string or float
 */
function PMA_pow($base, $exp, $use_function = false)
{
    static $pow_function = null;

    if (null == $pow_function) {
        $pow_function = PMA_detect_pow();
    }

    if (! $use_function) {
        $use_function = $pow_function;
    }

    if ($exp < 0 && 'pow' != $use_function) {
        return false;
    }
    switch ($use_function) {
    case 'bcpow' :
        // bcscale() needed for testing PMA_pow() with base values < 1
        bcscale(10);
        $pow = bcpow($base, $exp);
        break;
    case 'gmp_pow' :
         $pow = gmp_strval(gmp_pow($base, $exp));
        break;
    case 'pow' :
        $base = (float) $base;
        $exp = (int) $exp;
        $pow = pow($base, $exp);
        break;
    default:
        $pow = $use_function($base, $exp);
    }

    return $pow;
}

/**
 * string PMA_getIcon(string $icon)
 *
 * @param string  $icon       name of icon file
 * @param string  $alternate  alternate text
 * @param boolean $force_text whether to force alternate text to be displayed
 * @param boolean $noSprite   If true, the image source will be not replaced with a CSS Sprite
 *
 * @return html img tag
 */
function PMA_getIcon($icon, $alternate = '', $force_text = false, $noSprite = false)
{
    // $cfg['PropertiesIconic'] is true or both
    $include_icon = ($GLOBALS['cfg']['PropertiesIconic'] !== false);
    // $cfg['PropertiesIconic'] is false or both
    // OR we have no $include_icon
    $include_text = ($force_text || true !== $GLOBALS['cfg']['PropertiesIconic']);
    $alternate    = htmlspecialchars($alternate);
    $button       = '';

    // Always use a span (we rely on this in js/sql.js)
    $button .= '<span class="nowrap">';

    if ($include_icon) {
        if($noSprite) {
            $button .= '<img src="' . $GLOBALS['pmaThemeImage'] . $icon . '"'
                    . ' class="icon" width="16" height="16" />';
        } else {
            $button .= '<img src="themes/dot.gif"'
                . ' title="' . $alternate . '" alt="' . $alternate . '"'
                . ' class="icon ic_' . str_replace(array('.gif','.png'), '', $icon) . '" />';
        }
    }

    if ($include_icon && $include_text) {
        $button .= ' ';
    }

    if ($include_text) {
        $button .= $alternate;
    }

    $button .= '</span>';

    return $button;
}

/**
 * Displays the maximum size for an upload
 *
 * @param integer $max_upload_size the size
 *
 * @return string the message
 *
 * @access  public
 */
function PMA_displayMaximumUploadSize($max_upload_size)
{
    // I have to reduce the second parameter (sensitiveness) from 6 to 4
    // to avoid weird results like 512 kKib
    list($max_size, $max_unit) = PMA_formatByteDown($max_upload_size, 4);
    return '(' . sprintf(__('Max: %s%s'), $max_size, $max_unit) . ')';
}

/**
 * Generates a hidden field which should indicate to the browser
 * the maximum size for upload
 *
 * @param integer $max_size the size
 *
 * @return string the INPUT field
 *
 * @access  public
 */
function PMA_generateHiddenMaxFileSize($max_size)
{
    return '<input type="hidden" name="MAX_FILE_SIZE" value="' .$max_size . '" />';
}

/**
 * Add slashes before "'" and "\" characters so a value containing them can
 * be used in a sql comparison.
 *
 * @param string  $a_string the string to slash
 * @param bool    $is_like  whether the string will be used in a 'LIKE' clause
 *                          (it then requires two more escaped sequences) or not
 * @param bool    $crlf     whether to treat cr/lfs as escape-worthy entities
 *                          (converts \n to \\n, \r to \\r)
 * @param bool    $php_code whether this function is used as part of the
 *                          "Create PHP code" dialog
 *
 * @return  string   the slashed string
 *
 * @access  public
 */
function PMA_sqlAddSlashes($a_string = '', $is_like = false, $crlf = false, $php_code = false)
{
    if ($is_like) {
        $a_string = str_replace('\\', '\\\\\\\\', $a_string);
    } else {
        $a_string = str_replace('\\', '\\\\', $a_string);
    }

    if ($crlf) {
        $a_string = strtr(
            $a_string,
            array("\n" => '\n', "\r" => '\r', "\t" => '\t')
            );
    }

    if ($php_code) {
        $a_string = str_replace('\'', '\\\'', $a_string);
    } else {
        $a_string = str_replace('\'', '\'\'', $a_string);
    }

    return $a_string;
} // end of the 'PMA_sqlAddSlashes()' function


/**
 * Add slashes before "_" and "%" characters for using them in MySQL
 * database, table and field names.
 * Note: This function does not escape backslashes!
 *
 * @param string $name the string to escape
 *
 * @return string the escaped string
 *
 * @access  public
 */
function PMA_escape_mysql_wildcards($name)
{
    return strtr($name, array('_' => '\\_', '%' => '\\%'));
} // end of the 'PMA_escape_mysql_wildcards()' function

/**
 * removes slashes before "_" and "%" characters
 * Note: This function does not unescape backslashes!
 *
 * @param string   $name  the string to escape
 *
 * @return  string   the escaped string
 *
 * @access  public
 */
function PMA_unescape_mysql_wildcards($name)
{
    return strtr($name, array('\\_' => '_', '\\%' => '%'));
} // end of the 'PMA_unescape_mysql_wildcards()' function

/**
 * removes quotes (',",`) from a quoted string
 *
 * checks if the sting is quoted and removes this quotes
 *
 * @param string $quoted_string string to remove quotes from
 * @param string $quote         type of quote to remove
 *
 * @return string unqoted string
 */
function PMA_unQuote($quoted_string, $quote = null)
{
    $quotes = array();

    if (null === $quote) {
        $quotes[] = '`';
        $quotes[] = '"';
        $quotes[] = "'";
    } else {
        $quotes[] = $quote;
    }

    foreach ($quotes as $quote) {
        if (substr($quoted_string, 0, 1) === $quote
         && substr($quoted_string, -1, 1) === $quote) {
             $unquoted_string = substr($quoted_string, 1, -1);
             // replace escaped quotes
             $unquoted_string = str_replace(
                $quote . $quote,
                $quote,
                $unquoted_string);
             return $unquoted_string;
         }
    }

    return $quoted_string;
}

/**
 * format sql strings
 *
 * @todo    move into PMA_Sql
 * @param mixed  $parsed_sql   pre-parsed SQL structure
 * @param string $unparsed_sql raw SQL string
 *
 * @return string  the formatted sql
 *
 * @global  array    the configuration array
 * @global  boolean  whether the current statement is a multiple one or not
 *
 * @access  public
 *
 */
function PMA_formatSql($parsed_sql, $unparsed_sql = '')
{
    global $cfg;

    // Check that we actually have a valid set of parsed data
    // well, not quite
    // first check for the SQL parser having hit an error
    if (PMA_SQP_isError()) {
        return htmlspecialchars($parsed_sql['raw']);
    }
    // then check for an array
    if (! is_array($parsed_sql)) {
        // We don't so just return the input directly
        // This is intended to be used for when the SQL Parser is turned off
        $formatted_sql = "<pre>\n";
        if ($cfg['SQP']['fmtType'] == 'none' && $unparsed_sql != '') {
            $formatted_sql .= $unparsed_sql;
        } else {
            $formatted_sql .= $parsed_sql;
        }
        $formatted_sql .= "\n</pre>";
        return $formatted_sql;
    }

    $formatted_sql        = '';

    switch ($cfg['SQP']['fmtType']) {
    case 'none':
        if ($unparsed_sql != '') {
            $formatted_sql = '<span class="inner_sql"><pre>' . "\n"
                . PMA_SQP_formatNone(array('raw' => $unparsed_sql)) . "\n"
                . '</pre></span>';
        } else {
            $formatted_sql = PMA_SQP_formatNone($parsed_sql);
        }
        break;
    case 'html':
        $formatted_sql = PMA_SQP_formatHtml($parsed_sql, 'color');
        break;
    case 'text':
        $formatted_sql = PMA_SQP_formatHtml($parsed_sql, 'text');
        break;
    default:
        break;
    } // end switch

    return $formatted_sql;
} // end of the "PMA_formatSql()" function


/**
 * Displays a link to the official MySQL documentation
 *
 * @param string $chapter   chapter of "HTML, one page per chapter" documentation
 * @param string $link      contains name of page/anchor that is being linked
 * @param bool   $big_icon  whether to use big icon (like in left frame)
 * @param string $anchor    anchor to page part
 * @param bool   $just_open whether only the opening <a> tag should be returned
 *
 * @return  string  the html link
 *
 * @access  public
 */
function PMA_showMySQLDocu($chapter, $link, $big_icon = false, $anchor = '', $just_open = false)
{
    global $cfg;

    if ($cfg['MySQLManualType'] == 'none' || empty($cfg['MySQLManualBase'])) {
        return '';
    }

    // Fixup for newly used names:
    $chapter = str_replace('_', '-', strtolower($chapter));
    $link = str_replace('_', '-', strtolower($link));

    switch ($cfg['MySQLManualType']) {
    case 'chapters':
        if (empty($chapter)) {
            $chapter = 'index';
        }
        if (empty($anchor)) {
            $anchor = $link;
        }
        $url = $cfg['MySQLManualBase'] . '/' . $chapter . '.html#' . $anchor;
        break;
    case 'big':
        if (empty($anchor)) {
            $anchor = $link;
        }
        $url = $cfg['MySQLManualBase'] . '#' . $anchor;
        break;
    case 'searchable':
        if (empty($link)) {
            $link = 'index';
        }
        $url = $cfg['MySQLManualBase'] . '/' . $link . '.html';
        if (!empty($anchor)) {
            $url .= '#' . $anchor;
        }
        break;
    case 'viewable':
    default:
        if (empty($link)) {
            $link = 'index';
        }
        $mysql = '5.0';
        $lang = 'en';
        if (defined('PMA_MYSQL_INT_VERSION')) {
            if (PMA_MYSQL_INT_VERSION >= 50500) {
                $mysql = '5.5';
                /* l10n: Language to use for MySQL 5.5 documentation, please use only languages which do exist in official documentation.  */
                $lang = _pgettext('MySQL 5.5 documentation language', 'en');
            } else if (PMA_MYSQL_INT_VERSION >= 50100) {
                $mysql = '5.1';
                /* l10n: Language to use for MySQL 5.1 documentation, please use only languages which do exist in official documentation.  */
                $lang = _pgettext('MySQL 5.1 documentation language', 'en');
            } else {
                $mysql = '5.0';
                /* l10n: Language to use for MySQL 5.0 documentation, please use only languages which do exist in official documentation. */
                $lang = _pgettext('MySQL 5.0 documentation language', 'en');
            }
        }
        $url = $cfg['MySQLManualBase'] . '/' . $mysql . '/' . $lang . '/' . $link . '.html';
        if (!empty($anchor)) {
            $url .= '#' . $anchor;
        }
        break;
    }

    $open_link = '<a href="' . PMA_linkURL($url) . '" target="mysql_doc">';
    if ($just_open) {
        return $open_link;
    } elseif ($big_icon) {
        return $open_link . '<img class="icon ic_b_sqlhelp" src="themes/dot.gif" alt="' . __('Documentation') . '" title="' . __('Documentation') . '" /></a>';
    } elseif ($GLOBALS['cfg']['ReplaceHelpImg']) {
        return $open_link . '<img class="icon ic_b_help_s" src="themes/dot.gif" alt="' . __('Documentation') . '" title="' . __('Documentation') . '" /></a>';
    } else {
        return '[' . $open_link . __('Documentation') . '</a>]';
    }
} // end of the 'PMA_showMySQLDocu()' function


/**
 * Displays a link to the phpMyAdmin documentation
 *
 * @param string  $anchor  anchor in documentation
 *
 * @return  string  the html link
 *
 * @access  public
 */
function PMA_showDocu($anchor)
{
    if ($GLOBALS['cfg']['ReplaceHelpImg']) {
        return '<a href="Documentation.html#' . $anchor . '" target="documentation"><img class="icon ic_b_help_s" src="themes/dot.gif" alt="' . __('Documentation') . '" title="' . __('Documentation') . '" /></a>';
    } else {
        return '[<a href="Documentation.html#' . $anchor . '" target="documentation">' . __('Documentation') . '</a>]';
    }
} // end of the 'PMA_showDocu()' function

/**
 * Displays a link to the PHP documentation
 *
 * @param string  $target  anchor in documentation
 *
 * @return string  the html link
 *
 * @access  public
 */
function PMA_showPHPDocu($target)
{
    $url = PMA_getPHPDocLink($target);

    if ($GLOBALS['cfg']['ReplaceHelpImg']) {
        return '<a href="' . $url . '" target="documentation"><img class="icon ic_b_help_s" src="themes/dot.gif" alt="' . __('Documentation') . '" title="' . __('Documentation') . '" /></a>';
    } else {
        return '[<a href="' . $url . '" target="documentation">' . __('Documentation') . '</a>]';
    }
} // end of the 'PMA_showPHPDocu()' function

/**
 * returns HTML for a footnote marker and add the messsage to the footnotes
 *
 * @param string  $message the error message
 * @param bool    $bbcode
 * @param string  $type
 *
 * @return  string html code for a footnote marker
 *
 * @access  public
 */
function PMA_showHint($message, $bbcode = false, $type = 'notice')
{
    if ($message instanceof PMA_Message) {
        $key = $message->getHash();
        $type = $message->getLevel();
    } else {
        $key = md5($message);
    }

    if (! isset($GLOBALS['footnotes'][$key])) {
        if (empty($GLOBALS['footnotes']) || ! is_array($GLOBALS['footnotes'])) {
            $GLOBALS['footnotes'] = array();
        }
        $nr = count($GLOBALS['footnotes']) + 1;
        $GLOBALS['footnotes'][$key] = array(
            'note'      => $message,
            'type'      => $type,
            'nr'        => $nr,
        );
    } else {
        $nr = $GLOBALS['footnotes'][$key]['nr'];
    }

    if ($bbcode) {
        return '[sup]' . $nr . '[/sup]';
    }

    // footnotemarker used in js/tooltip.js
    return '<sup class="footnotemarker">' . $nr . '</sup>' .
    '<img class="footnotemarker footnote_' . $nr . ' ic_b_help" src="themes/dot.gif" alt="" />';
}

/**
 * Displays a MySQL error message in the right frame.
 *
 * @param string  $error_message   the error message
 * @param string  $the_query       the sql query that failed
 * @param bool    $is_modify_link  whether to show a "modify" link or not
 * @param string  $back_url        the "back" link url (full path is not required)
 * @param bool    $exit            EXIT the page?
 *
 * @global  string    the curent table
 * @global  string    the current db
 *
 * @access  public
 */
function PMA_mysqlDie($error_message = '', $the_query = '',
                        $is_modify_link = true, $back_url = '', $exit = true)
{
    global $table, $db;

    /**
     * start http output, display html headers
     */
    require_once './libraries/header.inc.php';

    $error_msg_output = '';

    if (!$error_message) {
        $error_message = PMA_DBI_getError();
    }
    if (!$the_query && !empty($GLOBALS['sql_query'])) {
        $the_query = $GLOBALS['sql_query'];
    }

    // --- Added to solve bug #641765
    if (!function_exists('PMA_SQP_isError') || PMA_SQP_isError()) {
        $formatted_sql = htmlspecialchars($the_query);
    } elseif (empty($the_query) || trim($the_query) == '') {
        $formatted_sql = '';
    } else {
        if (strlen($the_query) > $GLOBALS['cfg']['MaxCharactersInDisplayedSQL']) {
            $formatted_sql = htmlspecialchars(substr($the_query, 0, $GLOBALS['cfg']['MaxCharactersInDisplayedSQL'])) . '[...]';
        } else {
            $formatted_sql = PMA_formatSql(PMA_SQP_parse($the_query), $the_query);
        }
    }
    // ---
    $error_msg_output .= "\n" . '<!-- PMA-SQL-ERROR -->' . "\n";
    $error_msg_output .= '    <div class="error"><h1>' . __('Error') . '</h1>' . "\n";
    // if the config password is wrong, or the MySQL server does not
    // respond, do not show the query that would reveal the
    // username/password
    if (!empty($the_query) && !strstr($the_query, 'connect')) {
        // --- Added to solve bug #641765
        if (function_exists('PMA_SQP_isError') && PMA_SQP_isError()) {
            $error_msg_output .= PMA_SQP_getErrorString() . "\n";
            $error_msg_output .= '<br />' . "\n";
        }
        // ---
        // modified to show the help on sql errors
        $error_msg_output .= '    <p><strong>' . __('SQL query') . ':</strong>' . "\n";
        if (strstr(strtolower($formatted_sql), 'select')) { // please show me help to the error on select
            $error_msg_output .= PMA_showMySQLDocu('SQL-Syntax', 'SELECT');
        }
        if ($is_modify_link) {
            $_url_params = array(
                'sql_query' => $the_query,
                'show_query' => 1,
            );
            if (strlen($table)) {
                $_url_params['db'] = $db;
                $_url_params['table'] = $table;
                $doedit_goto = '<a href="tbl_sql.php?' . PMA_generate_common_url($_url_params) . '">';
            } elseif (strlen($db)) {
                $_url_params['db'] = $db;
                $doedit_goto = '<a href="db_sql.php?' . PMA_generate_common_url($_url_params) . '">';
            } else {
                $doedit_goto = '<a href="server_sql.php?' . PMA_generate_common_url($_url_params) . '">';
            }

            $error_msg_output .= $doedit_goto
               . PMA_getIcon('b_edit.png', __('Edit'))
               . '</a>';
        } // end if
        $error_msg_output .= '    </p>' . "\n"
            .'    <p>' . "\n"
            .'        ' . $formatted_sql . "\n"
            .'    </p>' . "\n";
    } // end if

    if (!empty($error_message)) {
        $error_message = preg_replace("@((\015\012)|(\015)|(\012)){3,}@", "\n\n", $error_message);
    }
    // modified to show the help on error-returns
    // (now error-messages-server)
    $error_msg_output .= '<p>' . "\n"
            . '    <strong>' . __('MySQL said: ') . '</strong>'
            . PMA_showMySQLDocu('Error-messages-server', 'Error-messages-server')
            . "\n"
            . '</p>' . "\n";

    // The error message will be displayed within a CODE segment.
    // To preserve original formatting, but allow wordwrapping, we do a couple of replacements

    // Replace all non-single blanks with their HTML-counterpart
    $error_message = str_replace('  ', '&nbsp;&nbsp;', $error_message);
    // Replace TAB-characters with their HTML-counterpart
    $error_message = str_replace("\t", '&nbsp;&nbsp;&nbsp;&nbsp;', $error_message);
    // Replace linebreaks
    $error_message = nl2br($error_message);

    $error_msg_output .= '<code>' . "\n"
        . $error_message . "\n"
        . '</code><br />' . "\n";
    $error_msg_output .= '</div>';

    $_SESSION['Import_message']['message'] = $error_msg_output;

    if ($exit) {
        /**
         * If in an Ajax request
         * - avoid displaying a Back link
         * - use PMA_ajaxResponse() to transmit the message and exit
         */
        if ($GLOBALS['is_ajax_request'] == true) {
            PMA_ajaxResponse($error_msg_output, false);
        }
        if (! empty($back_url)) {
            if (strstr($back_url, '?')) {
                $back_url .= '&amp;no_history=true';
            } else {
                $back_url .= '?no_history=true';
            }

            $_SESSION['Import_message']['go_back_url'] = $back_url;

            $error_msg_output .= '<fieldset class="tblFooters">';
            $error_msg_output .= '[ <a href="' . $back_url . '">' . __('Back') . '</a> ]';
            $error_msg_output .= '</fieldset>' . "\n\n";
        }

        echo $error_msg_output;
        /**
         * display footer and exit
         */
        require './libraries/footer.inc.php';
    } else {
        echo $error_msg_output;
    }
} // end of the 'PMA_mysqlDie()' function

/**
 * returns array with tables of given db with extended information and grouped
 *
 * @param string   $db     name of db
 * @param string   $tables name of tables
 * @param integer  $limit_offset   list offset
 * @param int|bool $limit_count    max tables to return
 *
 * @return  array    (recursive) grouped table list
 */
function PMA_getTableList($db, $tables = null, $limit_offset = 0, $limit_count = false)
{
    $sep = $GLOBALS['cfg']['LeftFrameTableSeparator'];

    if (null === $tables) {
        $tables = PMA_DBI_get_tables_full($db, false, false, null, $limit_offset, $limit_count);
        if ($GLOBALS['cfg']['NaturalOrder']) {
            uksort($tables, 'strnatcasecmp');
        }
    }

    if (count($tables) < 1) {
        return $tables;
    }

    $default = array(
        'Name'      => '',
        'Rows'      => 0,
        'Comment'   => '',
        'disp_name' => '',
    );

    $table_groups = array();

    // for blobstreaming - list of blobstreaming tables

    // load PMA configuration
    $PMA_Config = $GLOBALS['PMA_Config'];

    foreach ($tables as $table_name => $table) {
        // if BS tables exist
        if (PMA_BS_IsHiddenTable($table_name)) {
            continue;
        }

        // check for correct row count
        if (null === $table['Rows']) {
            // Do not check exact row count here,
            // if row count is invalid possibly the table is defect
            // and this would break left frame;
            // but we can check row count if this is a view or the
            // information_schema database
            // since PMA_Table::countRecords() returns a limited row count
            // in this case.

            // set this because PMA_Table::countRecords() can use it
            $tbl_is_view = $table['TABLE_TYPE'] == 'VIEW';

            if ($tbl_is_view || strtolower($db) == 'information_schema'
                    || (PMA_DRIZZLE && strtolower($db) == 'data_dictionary')) {
                $table['Rows'] = PMA_Table::countRecords($db, $table['Name'], false, true);
            }
        }

        // in $group we save the reference to the place in $table_groups
        // where to store the table info
        if ($GLOBALS['cfg']['LeftFrameDBTree']
            && $sep && strstr($table_name, $sep))
        {
            $parts = explode($sep, $table_name);

            $group =& $table_groups;
            $i = 0;
            $group_name_full = '';
            $parts_cnt = count($parts) - 1;
            while ($i < $parts_cnt
                    && $i < $GLOBALS['cfg']['LeftFrameTableLevel']) {
                $group_name = $parts[$i] . $sep;
                $group_name_full .= $group_name;

                if (! isset($group[$group_name])) {
                    $group[$group_name] = array();
                    $group[$group_name]['is' . $sep . 'group'] = true;
                    $group[$group_name]['tab' . $sep . 'count'] = 1;
                    $group[$group_name]['tab' . $sep . 'group'] = $group_name_full;
                } elseif (! isset($group[$group_name]['is' . $sep . 'group'])) {
                    $table = $group[$group_name];
                    $group[$group_name] = array();
                    $group[$group_name][$group_name] = $table;
                    unset($table);
                    $group[$group_name]['is' . $sep . 'group'] = true;
                    $group[$group_name]['tab' . $sep . 'count'] = 1;
                    $group[$group_name]['tab' . $sep . 'group'] = $group_name_full;
                } else {
                    $group[$group_name]['tab' . $sep . 'count']++;
                }
                $group =& $group[$group_name];
                $i++;
            }
        } else {
            if (! isset($table_groups[$table_name])) {
                $table_groups[$table_name] = array();
            }
            $group =& $table_groups;
        }


        if ($GLOBALS['cfg']['ShowTooltipAliasTB']
                && $GLOBALS['cfg']['ShowTooltipAliasTB'] !== 'nested') {
            // switch tooltip and name
            $table['Comment'] = $table['Name'];
            $table['disp_name'] = $table['Comment'];
        } else {
            $table['disp_name'] = $table['Name'];
        }

        $group[$table_name] = array_merge($default, $table);
    }

    return $table_groups;
}

/* ----------------------- Set of misc functions ----------------------- */


/**
 * Adds backquotes on both sides of a database, table or field name.
 * and escapes backquotes inside the name with another backquote
 *
 * example:
 * <code>
 * echo PMA_backquote('owner`s db'); // `owner``s db`
 *
 * </code>
 *
 * @param mixed    $a_name    the database, table or field name to "backquote"
 *                              or array of it
 * @param boolean  $do_it     a flag to bypass this function (used by dump
 *                              functions)
 *
 * @return  mixed    the "backquoted" database, table or field name
 *
 * @access  public
 */
function PMA_backquote($a_name, $do_it = true)
{
    if (is_array($a_name)) {
        foreach ($a_name as &$data) {
            $data = PMA_backquote($data, $do_it);
        }
        return $a_name;
    }

    if (! $do_it) {
        global $PMA_SQPdata_forbidden_word;

        if (! in_array(strtoupper($a_name), $PMA_SQPdata_forbidden_word)) {
            return $a_name;
        }
    }

    // '0' is also empty for php :-(
    if (strlen($a_name) && $a_name !== '*') {
        return '`' . str_replace('`', '``', $a_name) . '`';
    } else {
        return $a_name;
    }
} // end of the 'PMA_backquote()' function

/**
 * Defines the <CR><LF> value depending on the user OS.
 *
 * @return  string   the <CR><LF> value to use
 *
 * @access  public
 */
function PMA_whichCrlf()
{
    // The 'PMA_USR_OS' constant is defined in "./libraries/Config.class.php"
    // Win case
    if (PMA_USR_OS == 'Win') {
        $the_crlf = "\r\n";
    }
    // Others
    else {
        $the_crlf = "\n";
    }

    return $the_crlf;
} // end of the 'PMA_whichCrlf()' function

/**
 * Reloads navigation if needed.
 *
 * @param bool $jsonly prints out pure JavaScript
 *
 * @access  public
 */
function PMA_reloadNavigation($jsonly=false)
{
    // Reloads the navigation frame via JavaScript if required
    if (isset($GLOBALS['reload']) && $GLOBALS['reload']) {
        // one of the reasons for a reload is when a table is dropped
        // in this case, get rid of the table limit offset, otherwise
        // we have a problem when dropping a table on the last page
        // and the offset becomes greater than the total number of tables
        unset($_SESSION['tmp_user_values']['table_limit_offset']);
        echo "\n";
        $reload_url = './navigation.php?' . PMA_generate_common_url($GLOBALS['db'], '', '&');
        if (!$jsonly) {
            echo '<script type="text/javascript">' . PHP_EOL;
        }
    ?>
//<![CDATA[
if (typeof(window.parent) != 'undefined'
    && typeof(window.parent.frame_navigation) != 'undefined'
    && window.parent.goTo) {
    window.parent.goTo('<?php echo $reload_url; ?>');
}
//]]>
<?php
        if (!$jsonly) {
            echo '</script>' . PHP_EOL;
        }

        unset($GLOBALS['reload']);
    }
}

/**
 * displays the message and the query
 * usually the message is the result of the query executed
 *
 * @param string  $message    the message to display
 * @param string  $sql_query  the query to display
 * @param string  $type       the type (level) of the message
 * @param boolean $is_view    is this a message after a VIEW operation?
 *
 * @return  string
 *
 * @access  public
 */
function PMA_showMessage($message, $sql_query = null, $type = 'notice', $is_view = false)
{
    /*
     * PMA_ajaxResponse uses this function to collect the string of HTML generated
     * for showing the message.  Use output buffering to collect it and return it
     * in a string.  In some special cases on sql.php, buffering has to be disabled
     * and hence we check with $GLOBALS['buffer_message']
     */
    if ( $GLOBALS['is_ajax_request'] == true && ! isset($GLOBALS['buffer_message']) ) {
        ob_start();
    }
    global $cfg;

    if (null === $sql_query) {
        if (! empty($GLOBALS['display_query'])) {
            $sql_query = $GLOBALS['display_query'];
        } elseif ($cfg['SQP']['fmtType'] == 'none' && ! empty($GLOBALS['unparsed_sql'])) {
            $sql_query = $GLOBALS['unparsed_sql'];
        } elseif (! empty($GLOBALS['sql_query'])) {
            $sql_query = $GLOBALS['sql_query'];
        } else {
            $sql_query = '';
        }
    }

    if (isset($GLOBALS['using_bookmark_message'])) {
        $GLOBALS['using_bookmark_message']->display();
        unset($GLOBALS['using_bookmark_message']);
    }

    // Corrects the tooltip text via JS if required
    // @todo this is REALLY the wrong place to do this - very unexpected here
    if (! $is_view && strlen($GLOBALS['table']) && $cfg['ShowTooltip']) {
        $tooltip = PMA_Table::sGetToolTip($GLOBALS['db'], $GLOBALS['table']);
        $uni_tbl = PMA_jsFormat($GLOBALS['db'] . '.' . $GLOBALS['table'], false);
        echo "\n";
        echo '<script type="text/javascript">' . "\n";
        echo '//<![CDATA[' . "\n";
        echo "if (window.parent.updateTableTitle) window.parent.updateTableTitle('" . $uni_tbl . "', '" . PMA_jsFormat($tooltip, false) . "');" . "\n";
        echo '//]]>' . "\n";
        echo '</script>' . "\n";
    } // end if ... elseif

    // Checks if the table needs to be repaired after a TRUNCATE query.
    // @todo what about $GLOBALS['display_query']???
    // @todo this is REALLY the wrong place to do this - very unexpected here
    if (strlen($GLOBALS['table'])
     && $GLOBALS['sql_query'] == 'TRUNCATE TABLE ' . PMA_backquote($GLOBALS['table'])) {
        if (PMA_Table::sGetStatusInfo($GLOBALS['db'], $GLOBALS['table'], 'Index_length') > 1024 && !PMA_DRIZZLE) {
            PMA_DBI_try_query('REPAIR TABLE ' . PMA_backquote($GLOBALS['table']));
        }
    }
    unset($tbl_status);

    // In an Ajax request, $GLOBALS['cell_align_left'] may not be defined. Hence,
    // check for it's presence before using it
    echo '<div id="result_query" align="' . ( isset($GLOBALS['cell_align_left']) ? $GLOBALS['cell_align_left'] : '' ) . '">' . "\n";

    if ($message instanceof PMA_Message) {
        if (isset($GLOBALS['special_message'])) {
            $message->addMessage($GLOBALS['special_message']);
            unset($GLOBALS['special_message']);
        }
        $message->display();
        $type = $message->getLevel();
    } else {
        echo '<div class="' . $type . '">';
        echo PMA_sanitize($message);
        if (isset($GLOBALS['special_message'])) {
            echo PMA_sanitize($GLOBALS['special_message']);
            unset($GLOBALS['special_message']);
        }
        echo '</div>';
    }

    if ($cfg['ShowSQL'] == true && ! empty($sql_query)) {
        // Html format the query to be displayed
        // If we want to show some sql code it is easiest to create it here
        /* SQL-Parser-Analyzer */

        if (! empty($GLOBALS['show_as_php'])) {
            $new_line = '\\n"<br />' . "\n"
                . '&nbsp;&nbsp;&nbsp;&nbsp;. "';
            $query_base = htmlspecialchars(addslashes($sql_query));
            $query_base = preg_replace('/((\015\012)|(\015)|(\012))/', $new_line, $query_base);
        } else {
            $query_base = $sql_query;
        }

        $query_too_big = false;

        if (strlen($query_base) > $cfg['MaxCharactersInDisplayedSQL']) {
            // when the query is large (for example an INSERT of binary
            // data), the parser chokes; so avoid parsing the query
            $query_too_big = true;
            $shortened_query_base = nl2br(htmlspecialchars(substr($sql_query, 0, $cfg['MaxCharactersInDisplayedSQL']) . '[...]'));
        } elseif (! empty($GLOBALS['parsed_sql'])
         && $query_base == $GLOBALS['parsed_sql']['raw']) {
            // (here, use "! empty" because when deleting a bookmark,
            // $GLOBALS['parsed_sql'] is set but empty
            $parsed_sql = $GLOBALS['parsed_sql'];
        } else {
            // Parse SQL if needed
            $parsed_sql = PMA_SQP_parse($query_base);
            if (PMA_SQP_isError()) {
                unset($parsed_sql);
            }
        }

        // Analyze it
        if (isset($parsed_sql)) {
            $analyzed_display_query = PMA_SQP_analyze($parsed_sql);

            // Same as below (append LIMIT), append the remembered ORDER BY
            if ($GLOBALS['cfg']['RememberSorting']
             && isset($analyzed_display_query[0]['queryflags']['select_from'])
             && isset($GLOBALS['sql_order_to_append'])) {
                $query_base = $analyzed_display_query[0]['section_before_limit']
                    . "\n" . $GLOBALS['sql_order_to_append']
                    . $analyzed_display_query[0]['section_after_limit'];

                // Need to reparse query
                $parsed_sql = PMA_SQP_parse($query_base);
                // update the $analyzed_display_query
                $analyzed_display_query[0]['section_before_limit'] .= $GLOBALS['sql_order_to_append'];
                $analyzed_display_query[0]['order_by_clause'] = $GLOBALS['sorted_col'];
            }

            // Here we append the LIMIT added for navigation, to
            // enable its display. Adding it higher in the code
            // to $sql_query would create a problem when
            // using the Refresh or Edit links.

            // Only append it on SELECTs.

            /**
             * @todo what would be the best to do when someone hits Refresh:
             * use the current LIMITs ?
             */

            if (isset($analyzed_display_query[0]['queryflags']['select_from'])
             && isset($GLOBALS['sql_limit_to_append'])) {
                $query_base = $analyzed_display_query[0]['section_before_limit']
                    . "\n" . $GLOBALS['sql_limit_to_append']
                    . $analyzed_display_query[0]['section_after_limit'];
                // Need to reparse query
                $parsed_sql = PMA_SQP_parse($query_base);
            }
        }

        if (! empty($GLOBALS['show_as_php'])) {
            $query_base = '$sql  = "' . $query_base;
        } elseif (! empty($GLOBALS['validatequery'])) {
            try {
                $query_base = PMA_validateSQL($query_base);
            } catch (Exception $e) {
                PMA_Message::error(__('Failed to connect to SQL validator!'))->display();
            }
        } elseif (isset($parsed_sql)) {
            $query_base = PMA_formatSql($parsed_sql, $query_base);
        }

        // Prepares links that may be displayed to edit/explain the query
        // (don't go to default pages, we must go to the page
        // where the query box is available)

        // Basic url query part
        $url_params = array();
        if (! isset($GLOBALS['db'])) {
            $GLOBALS['db'] = '';
        }
        if (strlen($GLOBALS['db'])) {
            $url_params['db'] = $GLOBALS['db'];
            if (strlen($GLOBALS['table'])) {
                $url_params['table'] = $GLOBALS['table'];
                $edit_link = 'tbl_sql.php';
            } else {
                $edit_link = 'db_sql.php';
            }
        } else {
            $edit_link = 'server_sql.php';
        }

        // Want to have the query explained
        // but only explain a SELECT (that has not been explained)
        /* SQL-Parser-Analyzer */
        $explain_link = '';
        $is_select = false;
        if (! empty($cfg['SQLQuery']['Explain']) && ! $query_too_big) {
            $explain_params = $url_params;
            // Detect if we are validating as well
            // To preserve the validate uRL data
            if (! empty($GLOBALS['validatequery'])) {
                $explain_params['validatequery'] = 1;
            }
            if (preg_match('@^SELECT[[:space:]]+@i', $sql_query)) {
                $explain_params['sql_query'] = 'EXPLAIN ' . $sql_query;
                $_message = __('Explain SQL');
                $is_select = true;
            } elseif (preg_match('@^EXPLAIN[[:space:]]+SELECT[[:space:]]+@i', $sql_query)) {
                $explain_params['sql_query'] = substr($sql_query, 8);
                $_message = __('Skip Explain SQL');
            }
            if (isset($explain_params['sql_query'])) {
                $explain_link = 'import.php' . PMA_generate_common_url($explain_params);
                $explain_link = ' [' . PMA_linkOrButton($explain_link, $_message) . ']';
            }
        } //show explain

        $url_params['sql_query']  = $sql_query;
        $url_params['show_query'] = 1;

        // even if the query is big and was truncated, offer the chance
        // to edit it (unless it's enormous, see PMA_linkOrButton() )
        if (! empty($cfg['SQLQuery']['Edit'])) {
            if ($cfg['EditInWindow'] == true) {
                $onclick = 'window.parent.focus_querywindow(\'' . PMA_jsFormat($sql_query, false) . '\'); return false;';
            } else {
                $onclick = '';
            }

            $edit_link .= PMA_generate_common_url($url_params) . '#querybox';
            $edit_link = ' [' . PMA_linkOrButton($edit_link, __('Edit'), array('onclick' => $onclick)) . ']';
        } else {
            $edit_link = '';
        }

        $url_qpart = PMA_generate_common_url($url_params);

        // Also we would like to get the SQL formed in some nice
        // php-code
        if (! empty($cfg['SQLQuery']['ShowAsPHP']) && ! $query_too_big) {
            $php_params = $url_params;

            if (! empty($GLOBALS['show_as_php'])) {
                $_message = __('Without PHP Code');
            } else {
                $php_params['show_as_php'] = 1;
                $_message = __('Create PHP Code');
            }

            $php_link = 'import.php' . PMA_generate_common_url($php_params);
            $php_link = ' [' . PMA_linkOrButton($php_link, $_message) . ']';

            if (isset($GLOBALS['show_as_php'])) {
                $runquery_link = 'import.php' . PMA_generate_common_url($url_params);
                $php_link .= ' [' . PMA_linkOrButton($runquery_link, __('Submit Query')) . ']';
            }
        } else {
            $php_link = '';
        } //show as php

        // Refresh query
        if (! empty($cfg['SQLQuery']['Refresh'])
         && preg_match('@^(SELECT|SHOW)[[:space:]]+@i', $sql_query)) {
            $refresh_link = 'import.php' . PMA_generate_common_url($url_params);
            $refresh_link = ' [' . PMA_linkOrButton($refresh_link, __('Refresh')) . ']';
        } else {
            $refresh_link = '';
        } //show as php

        if (! empty($cfg['SQLValidator']['use'])
         && ! empty($cfg['SQLQuery']['Validate'])) {
            $validate_params = $url_params;
            if (!empty($GLOBALS['validatequery'])) {
                $validate_message = __('Skip Validate SQL') ;
            } else {
                $validate_params['validatequery'] = 1;
                $validate_message = __('Validate SQL') ;
            }

            $validate_link = 'import.php' . PMA_generate_common_url($validate_params);
            $validate_link = ' [' . PMA_linkOrButton($validate_link, $validate_message) . ']';
        } else {
            $validate_link = '';
        } //validator

        if (!empty($GLOBALS['validatequery'])) {
            echo '<div class="sqlvalidate">';
        } else {
            echo '<code class="sql">';
        }
        if ($query_too_big) {
            echo $shortened_query_base;
        } else {
            echo $query_base;
        }

        //Clean up the end of the PHP
        if (! empty($GLOBALS['show_as_php'])) {
            echo '";';
        }
        if (!empty($GLOBALS['validatequery'])) {
            echo '</div>';
        } else {
            echo '</code>';
        }

        echo '<div class="tools">';
        // avoid displaying a Profiling checkbox that could
        // be checked, which would reexecute an INSERT, for example
        if (! empty($refresh_link)) {
            PMA_profilingCheckbox($sql_query);
        }
        // if needed, generate an invisible form that contains controls for the
        // Inline link; this way, the behavior of the Inline link does not
        // depend on the profiling support or on the refresh link
        if (empty($refresh_link) || ! PMA_profilingSupported()) {
            echo '<form action="sql.php" method="post">';
            echo PMA_generate_common_hidden_inputs($GLOBALS['db'], $GLOBALS['table']);
            echo '<input type="hidden" name="sql_query" value="' . htmlspecialchars($sql_query) . '" />';
            echo '</form>';
        }

        // in the tools div, only display the Inline link when not in ajax
        // mode because 1) it currently does not work and 2) we would
        // have two similar mechanisms on the page for the same goal
        if ($is_select || $GLOBALS['is_ajax_request'] === false && ! $query_too_big) {
            // see in js/functions.js the jQuery code attached to id inline_edit
            // document.write conflicts with jQuery, hence used $().append()
            echo "<script type=\"text/javascript\">\n" .
                "//<![CDATA[\n" .
                "$('.tools form').last().after('[<a href=\"#\" title=\"" .
                PMA_escapeJsString(__('Inline edit of this query')) .
                "\" class=\"inline_edit_sql\">" .
                PMA_escapeJsString(_pgettext('Inline edit query', 'Inline')) .
                "</a>]');\n" .
                "//]]>\n" .
                "</script>";
        }
        echo $edit_link . $explain_link . $php_link . $refresh_link . $validate_link;
        echo '</div>';
    }
    echo '</div>';
    if ($GLOBALS['is_ajax_request'] === false) {
        echo '<br class="clearfloat" />';
    }

    // If we are in an Ajax request, we have most probably been called in
    // PMA_ajaxResponse().  Hence, collect the buffer contents and return it
    // to PMA_ajaxResponse(), which will encode it for JSON.
    if ( $GLOBALS['is_ajax_request'] == true && ! isset($GLOBALS['buffer_message']) ) {
        $buffer_contents =  ob_get_contents();
        ob_end_clean();
        return $buffer_contents;
    }
    return null;
} // end of the 'PMA_showMessage()' function

/**
 * Verifies if current MySQL server supports profiling
 *
 * @access  public
 *
 * @return  boolean whether profiling is supported
 */
function PMA_profilingSupported()
{
    if (! PMA_cacheExists('profiling_supported', true)) {
        // 5.0.37 has profiling but for example, 5.1.20 does not
        // (avoid a trip to the server for MySQL before 5.0.37)
        // and do not set a constant as we might be switching servers
        if (defined('PMA_MYSQL_INT_VERSION')
         && PMA_MYSQL_INT_VERSION >= 50037
         && PMA_DBI_fetch_value("SHOW VARIABLES LIKE 'profiling'")) {
            PMA_cacheSet('profiling_supported', true, true);
        } else {
            PMA_cacheSet('profiling_supported', false, true);
        }
    }

    return PMA_cacheGet('profiling_supported', true);
}

/**
 * Displays a form with the Profiling checkbox
 *
 * @param string  $sql_query
 * @access  public
 */
function PMA_profilingCheckbox($sql_query)
{
    if (PMA_profilingSupported()) {
        echo '<form action="sql.php" method="post">' . "\n";
        echo PMA_generate_common_hidden_inputs($GLOBALS['db'], $GLOBALS['table']);
        echo '<input type="hidden" name="sql_query" value="' . htmlspecialchars($sql_query) . '" />' . "\n";
        echo '<input type="hidden" name="profiling_form" value="1" />' . "\n";
        PMA_display_html_checkbox('profiling', __('Profiling'), isset($_SESSION['profiling']), true);
        echo '<noscript><input type="submit" value="' . __('Go') . '" /></noscript>' . "\n";
        echo '</form>' . "\n";
    }
}

/**
 * Formats $value to byte view
 *
 * @param double $value  the value to format
 * @param int    $limes  the sensitiveness
 * @param int    $comma  the number of decimals to retain
 *
 * @return   array    the formatted value and its unit
 *
 * @access  public
 */
function PMA_formatByteDown($value, $limes = 6, $comma = 0)
{
    if ($value === null) {
        return null;
    }

    $byteUnits = array(
        /* l10n: shortcuts for Byte */
        __('B'),
        /* l10n: shortcuts for Kilobyte */
        __('KiB'),
        /* l10n: shortcuts for Megabyte */
        __('MiB'),
        /* l10n: shortcuts for Gigabyte */
        __('GiB'),
        /* l10n: shortcuts for Terabyte */
        __('TiB'),
        /* l10n: shortcuts for Petabyte */
        __('PiB'),
        /* l10n: shortcuts for Exabyte */
        __('EiB')
        );

    $dh   = PMA_pow(10, $comma);
    $li   = PMA_pow(10, $limes);
    $unit = $byteUnits[0];

    for ($d = 6, $ex = 15; $d >= 1; $d--, $ex-=3) {
        if (isset($byteUnits[$d]) && $value >= $li * PMA_pow(10, $ex)) {
            // use 1024.0 to avoid integer overflow on 64-bit machines
            $value = round($value / (PMA_pow(1024, $d) / $dh)) /$dh;
            $unit = $byteUnits[$d];
            break 1;
        } // end if
    } // end for

    if ($unit != $byteUnits[0]) {
        // if the unit is not bytes (as represented in current language)
        // reformat with max length of 5
        // 4th parameter=true means do not reformat if value < 1
        $return_value = PMA_formatNumber($value, 5, $comma, true);
    } else {
        // do not reformat, just handle the locale
        $return_value = PMA_formatNumber($value, 0);
    }

    return array(trim($return_value), $unit);
} // end of the 'PMA_formatByteDown' function

/**
 * Changes thousands and decimal separators to locale specific values.
 *
 * @param $value
 *
 * @return string
 */
function PMA_localizeNumber($value)
{
    return str_replace(
        array(',', '.'),
        array(
            /* l10n: Thousands separator */
            __(','),
            /* l10n: Decimal separator */
            __('.'),
            ),
        $value);
}

/**
 * Formats $value to the given length and appends SI prefixes
 * with a $length of 0 no truncation occurs, number is only formated
 * to the current locale
 *
 * examples:
 * <code>
 * echo PMA_formatNumber(123456789, 6);     // 123,457 k
 * echo PMA_formatNumber(-123456789, 4, 2); //    -123.46 M
 * echo PMA_formatNumber(-0.003, 6);        //      -3 m
 * echo PMA_formatNumber(0.003, 3, 3);      //       0.003
 * echo PMA_formatNumber(0.00003, 3, 2);    //       0.03 m
 * echo PMA_formatNumber(0, 6);             //       0
 *
 * </code>
 * @param double   $value            the value to format
 * @param integer  $digits_left      number of digits left of the comma
 * @param integer  $digits_right     number of digits right of the comma
 * @param boolean  $only_down        do not reformat numbers below 1
 * @param boolean  $noTrailingZero   removes trailing zeros right of the comma (default: true)
 *
 * @return  string   the formatted value and its unit
 *
 * @access  public
 */
function PMA_formatNumber($value, $digits_left = 3, $digits_right = 0, $only_down = false, $noTrailingZero = true)
{
    if ($value==0) return '0';

    $originalValue = $value;
    //number_format is not multibyte safe, str_replace is safe
    if ($digits_left === 0) {
        $value = number_format($value, $digits_right);
        if ($originalValue != 0 && floatval($value) == 0) {
            $value = ' <' . (1 / PMA_pow(10, $digits_right));
        }

        return PMA_localizeNumber($value);
    }

    // this units needs no translation, ISO
    $units = array(
        -8 => 'y',
        -7 => 'z',
        -6 => 'a',
        -5 => 'f',
        -4 => 'p',
        -3 => 'n',
        -2 => '&micro;',
        -1 => 'm',
        0 => ' ',
        1 => 'k',
        2 => 'M',
        3 => 'G',
        4 => 'T',
        5 => 'P',
        6 => 'E',
        7 => 'Z',
        8 => 'Y'
    );

    // check for negative value to retain sign
    if ($value < 0) {
        $sign = '-';
        $value = abs($value);
    } else {
        $sign = '';
    }

    $dh = PMA_pow(10, $digits_right);

    /*
     * This gives us the right SI prefix already,
     * but $digits_left parameter not incorporated
     */
    $d = floor(log10($value) / 3);
    /*
     * Lowering the SI prefix by 1 gives us an additional 3 zeros
     * So if we have 3,6,9,12.. free digits ($digits_left - $cur_digits)
     * to use, then lower the SI prefix
     */
    $cur_digits = floor(log10($value / PMA_pow(1000, $d, 'pow'))+1);
    if ($digits_left > $cur_digits) {
        $d-= floor(($digits_left - $cur_digits)/3);
    }

    if ($d<0 && $only_down) $d=0;

    $value = round($value / (PMA_pow(1000, $d, 'pow') / $dh)) /$dh;
    $unit = $units[$d];

    // If we dont want any zeros after the comma just add the thousand seperator
    if ($noTrailingZero) {
        $value = PMA_localizeNumber(
            preg_replace('/(?<=\d)(?=(\d{3})+(?!\d))/', ',', $value)
            );
    } else {
        //number_format is not multibyte safe, str_replace is safe
        $value = PMA_localizeNumber(number_format($value, $digits_right));
    }

    if ($originalValue!=0 && floatval($value) == 0) {
        return ' <' . (1 / PMA_pow(10, $digits_right)) . ' ' . $unit;
    }

    return $sign . $value . ' ' . $unit;
} // end of the 'PMA_formatNumber' function

/**
 * Returns the number of bytes when a formatted size is given
 *
 * @param string  $formatted_size  the size expression (for example 8MB)
 *
 * @return  integer  The numerical part of the expression (for example 8)
 */
function PMA_extractValueFromFormattedSize($formatted_size)
{
    $return_value = -1;

    if (preg_match('/^[0-9]+GB$/', $formatted_size)) {
        $return_value = substr($formatted_size, 0, -2) * PMA_pow(1024, 3);
    } elseif (preg_match('/^[0-9]+MB$/', $formatted_size)) {
        $return_value = substr($formatted_size, 0, -2) * PMA_pow(1024, 2);
    } elseif (preg_match('/^[0-9]+K$/', $formatted_size)) {
        $return_value = substr($formatted_size, 0, -1) * PMA_pow(1024, 1);
    }
    return $return_value;
}// end of the 'PMA_extractValueFromFormattedSize' function

/**
 * Writes localised date
 *
 * @param string $timestamp  the current timestamp
 * @param string $format     format
 *
 * @return  string   the formatted date
 *
 * @access  public
 */
function PMA_localisedDate($timestamp = -1, $format = '')
{
    $month = array(
        /* l10n: Short month name */
        __('Jan'),
        /* l10n: Short month name */
        __('Feb'),
        /* l10n: Short month name */
        __('Mar'),
        /* l10n: Short month name */
        __('Apr'),
        /* l10n: Short month name */
        _pgettext('Short month name', 'May'),
        /* l10n: Short month name */
        __('Jun'),
        /* l10n: Short month name */
        __('Jul'),
        /* l10n: Short month name */
        __('Aug'),
        /* l10n: Short month name */
        __('Sep'),
        /* l10n: Short month name */
        __('Oct'),
        /* l10n: Short month name */
        __('Nov'),
        /* l10n: Short month name */
        __('Dec'));
    $day_of_week = array(
        /* l10n: Short week day name */
        _pgettext('Short week day name', 'Sun'),
        /* l10n: Short week day name */
        __('Mon'),
        /* l10n: Short week day name */
        __('Tue'),
        /* l10n: Short week day name */
        __('Wed'),
        /* l10n: Short week day name */
        __('Thu'),
        /* l10n: Short week day name */
        __('Fri'),
        /* l10n: Short week day name */
        __('Sat'));

    if ($format == '') {
        /* l10n: See http://www.php.net/manual/en/function.strftime.php to define the format string */
        $format = __('%B %d, %Y at %I:%M %p');
    }

    if ($timestamp == -1) {
        $timestamp = time();
    }

    $date = preg_replace('@%[aA]@', $day_of_week[(int)strftime('%w', $timestamp)], $format);
    $date = preg_replace('@%[bB]@', $month[(int)strftime('%m', $timestamp)-1], $date);

    return strftime($date, $timestamp);
} // end of the 'PMA_localisedDate()' function


/**
 * returns a tab for tabbed navigation.
 * If the variables $link and $args ar left empty, an inactive tab is created
 *
 * @param array   $tab    array with all options
 * @param array   $url_params
 *
 * @return  string  html code for one tab, a link if valid otherwise a span
 *
 * @access  public
 */
function PMA_generate_html_tab($tab, $url_params = array(), $base_dir='')
{
    // default values
    $defaults = array(
        'text'      => '',
        'class'     => '',
        'active'    => null,
        'link'      => '',
        'sep'       => '?',
        'attr'      => '',
        'args'      => '',
        'warning'   => '',
        'fragment'  => '',
        'id'        => '',
    );

    $tab = array_merge($defaults, $tab);

    // determine additionnal style-class
    if (empty($tab['class'])) {
        if (! empty($tab['active'])
         || PMA_isValid($GLOBALS['active_page'], 'identical', $tab['link'])) {
            $tab['class'] = 'active';
        } elseif (is_null($tab['active']) && empty($GLOBALS['active_page'])
          && basename($GLOBALS['PMA_PHP_SELF']) == $tab['link']
          && empty($tab['warning'])) {
            $tab['class'] = 'active';
        }
    }

    if (!empty($tab['warning'])) {
        $tab['class'] .= ' error';
        $tab['attr'] .= ' title="' . htmlspecialchars($tab['warning']) . '"';
    }

    // If there are any tab specific URL parameters, merge those with the general URL parameters
    if (! empty($tab['url_params']) && is_array($tab['url_params'])) {
        $url_params = array_merge($url_params, $tab['url_params']);
    }

    // build the link
    if (!empty($tab['link'])) {
        $tab['link'] = htmlentities($tab['link']);
        $tab['link'] = $tab['link'] . PMA_generate_common_url($url_params);
        if (! empty($tab['args'])) {
            foreach ($tab['args'] as $param => $value) {
                $tab['link'] .= PMA_get_arg_separator('html') . urlencode($param) . '='
                    . urlencode($value);
            }
        }
    }

    if (! empty($tab['fragment'])) {
        $tab['link'] .= $tab['fragment'];
    }

    // display icon, even if iconic is disabled but the link-text is missing
    if (($GLOBALS['cfg']['MainPageIconic'] || empty($tab['text']))
        && isset($tab['icon'])) {
        // avoid generating an alt tag, because it only illustrates
        // the text that follows and if browser does not display
        // images, the text is duplicated
        $image = '<img class="icon %1$s" src="' . $base_dir . 'themes/dot.gif"'
            .' width="16" height="16" alt="" />%2$s';
        $tab['text'] = sprintf($image, htmlentities($tab['icon']), $tab['text']);
    }
    // check to not display an empty link-text
    elseif (empty($tab['text'])) {
        $tab['text'] = '?';
        trigger_error('empty linktext in function ' . __FUNCTION__ . '()',
            E_USER_NOTICE);
    }

    //Set the id for the tab, if set in the params
    $id_string = ( empty($tab['id']) ? '' : ' id="'.$tab['id'].'" ' );
    $out = '<li' . ($tab['class'] == 'active' ? ' class="active"' : '') . '>';

    if (!empty($tab['link'])) {
        $out .= '<a class="tab' . htmlentities($tab['class']) . '"'
            .$id_string
            .' href="' . $tab['link'] . '" ' . $tab['attr'] . '>'
            . $tab['text'] . '</a>';
    } else {
        $out .= '<span class="tab' . htmlentities($tab['class']) . '"'.$id_string.'>'
            . $tab['text'] . '</span>';
    }

    $out .= '</li>';
    return $out;
} // end of the 'PMA_generate_html_tab()' function

/**
 * returns html-code for a tab navigation
 *
 * @param array   $tabs   one element per tab
 * @param string  $url_params
 *
 * @return  string  html-code for tab-navigation
 */
function PMA_generate_html_tabs($tabs, $url_params, $base_dir='')
{
    $tag_id = 'topmenu';
    $tab_navigation =
         '<div id="' . htmlentities($tag_id) . 'container">' . "\n"
        .'<ul id="' . htmlentities($tag_id) . '">' . "\n";

    foreach ($tabs as $tab) {
        $tab_navigation .= PMA_generate_html_tab($tab, $url_params, $base_dir);
    }

    $tab_navigation .=
         '</ul>' . "\n"
        .'<div class="clearfloat"></div>'
        .'</div>' . "\n";

    return $tab_navigation;
}


/**
 * Displays a link, or a button if the link's URL is too large, to
 * accommodate some browsers' limitations
 *
 * @param string  $url the URL
 * @param string  $message the link message
 * @param mixed   $tag_params  string: js confirmation
 *                              array: additional tag params (f.e. style="")
 * @param boolean $new_form    we set this to false when we are already in
 *                              a  form, to avoid generating nested forms
 * @param boolean $strip_img
 * @param string  $target
 *
 * @return string  the results to be echoed or saved in an array
 */
function PMA_linkOrButton($url, $message, $tag_params = array(),
    $new_form = true, $strip_img = false, $target = '')
{
    $url_length = strlen($url);
    // with this we should be able to catch case of image upload
    // into a (MEDIUM) BLOB; not worth generating even a form for these
    if ($url_length > $GLOBALS['cfg']['LinkLengthLimit'] * 100) {
        return '';
    }


    if (! is_array($tag_params)) {
        $tmp = $tag_params;
        $tag_params = array();
        if (!empty($tmp)) {
            $tag_params['onclick'] = 'return confirmLink(this, \'' . PMA_escapeJsString($tmp) . '\')';
        }
        unset($tmp);
    }
    if (! empty($target)) {
        $tag_params['target'] = htmlentities($target);
    }

    $tag_params_strings = array();
    foreach ($tag_params as $par_name => $par_value) {
        // htmlspecialchars() only on non javascript
        $par_value = substr($par_name, 0, 2) == 'on'
            ? $par_value
            : htmlspecialchars($par_value);
        $tag_params_strings[] = $par_name . '="' . $par_value . '"';
    }

    $displayed_message = '';
    // Add text if not already added
    if (stristr($message, '<img') && (!$strip_img || $GLOBALS['cfg']['PropertiesIconic'] === true) && strip_tags($message)==$message) {
        $displayed_message = '<span>' . htmlspecialchars(preg_replace('/^.*\salt="([^"]*)".*$/si', '\1', $message)) . '</span>';
    }

    // Suhosin: Check that each query parameter is not above maximum
    $in_suhosin_limits = true;
    if ($url_length <= $GLOBALS['cfg']['LinkLengthLimit']) {
        if ($suhosin_get_MaxValueLength = ini_get('suhosin.get.max_value_length')) {
            $query_parts = PMA_splitURLQuery($url);
            foreach($query_parts as $query_pair) {
                list($eachvar, $eachval) = explode('=', $query_pair);
                if(strlen($eachval) > $suhosin_get_MaxValueLength) {
                    $in_suhosin_limits = false;
                    break;
                }
            }
        }
    }

    if ($url_length <= $GLOBALS['cfg']['LinkLengthLimit'] && $in_suhosin_limits) {
        // no whitespace within an <a> else Safari will make it part of the link
        $ret = "\n" . '<a href="' . $url . '" '
            . implode(' ', $tag_params_strings) . '>'
            . $message . $displayed_message . '</a>' . "\n";
    } else {
        // no spaces (linebreaks) at all
        // or after the hidden fields
        // IE will display them all

        // add class=link to submit button
        if (empty($tag_params['class'])) {
            $tag_params['class'] = 'link';
        }

        if (! isset($query_parts)) {
            $query_parts = PMA_splitURLQuery($url);
        }
        $url_parts   = parse_url($url);

        if ($new_form) {
            $ret = '<form action="' . $url_parts['path'] . '" class="link"'
                 . ' method="post"' . $target . ' style="display: inline;">';
            $subname_open   = '';
            $subname_close  = '';
            $submit_link    = '#';
        } else {
            $query_parts[] = 'redirect=' . $url_parts['path'];
            if (empty($GLOBALS['subform_counter'])) {
                $GLOBALS['subform_counter'] = 0;
            }
            $GLOBALS['subform_counter']++;
            $ret            = '';
            $subname_open   = 'subform[' . $GLOBALS['subform_counter'] . '][';
            $subname_close  = ']';
            $submit_link    = '#usesubform[' . $GLOBALS['subform_counter'] . ']=1';
        }
        foreach ($query_parts as $query_pair) {
            list($eachvar, $eachval) = explode('=', $query_pair);
            $ret .= '<input type="hidden" name="' . $subname_open . $eachvar
                . $subname_close . '" value="'
                . htmlspecialchars(urldecode($eachval)) . '" />';
        } // end while

        $ret .= "\n" . '<a href="' . $submit_link . '" class="formLinkSubmit" '
        . implode(' ', $tag_params_strings) . '>'
        . $message . ' ' . $displayed_message . '</a>' . "\n";

        if ($new_form) {
            $ret .= '</form>';
        }
    } // end if... else...

    return $ret;
} // end of the 'PMA_linkOrButton()' function


/**
 * Splits a URL string by parameter
 *
 * @param string  $url the URL
 * @return array  the parameter/value pairs, for example [0] db=sakila
 */
function PMA_splitURLQuery($url) {
    // decode encoded url separators
    $separator   = PMA_get_arg_separator();
    // on most places separator is still hard coded ...
    if ($separator !== '&') {
        // ... so always replace & with $separator
        $url         = str_replace(htmlentities('&'), $separator, $url);
        $url         = str_replace('&', $separator, $url);
    }
    $url         = str_replace(htmlentities($separator), $separator, $url);
    // end decode

    $url_parts   = parse_url($url);
    return explode($separator, $url_parts['query']);
}

/**
 * Returns a given timespan value in a readable format.
 *
 * @param int  $seconds  the timespan
 *
 * @return string  the formatted value
 */
function PMA_timespanFormat($seconds)
{
    $days = floor($seconds / 86400);
    if ($days > 0) {
        $seconds -= $days * 86400;
    }
    $hours = floor($seconds / 3600);
    if ($days > 0 || $hours > 0) {
        $seconds -= $hours * 3600;
    }
    $minutes = floor($seconds / 60);
    if ($days > 0 || $hours > 0 || $minutes > 0) {
        $seconds -= $minutes * 60;
    }
    return sprintf(__('%s days, %s hours, %s minutes and %s seconds'), (string)$days, (string)$hours, (string)$minutes, (string)$seconds);
}

/**
 * Takes a string and outputs each character on a line for itself. Used
 * mainly for horizontalflipped display mode.
 * Takes care of special html-characters.
 * Fulfills todo-item
 * http://sf.net/tracker/?func=detail&aid=544361&group_id=23067&atid=377411
 *
 * @todo    add a multibyte safe function PMA_STR_split()
 * @param string  $string     The string
 * @param string  $Separator  The Separator (defaults to "<br />\n")
 *
 * @access  public
 *
 * @return  string      The flipped string
 */
function PMA_flipstring($string, $Separator = "<br />\n")
{
    $format_string = '';
    $charbuff = false;

    for ($i = 0, $str_len = strlen($string); $i < $str_len; $i++) {
        $char = $string{$i};
        $append = false;

        if ($char == '&') {
            $format_string .= $charbuff;
            $charbuff = $char;
        } elseif ($char == ';' && !empty($charbuff)) {
            $format_string .= $charbuff . $char;
            $charbuff = false;
            $append = true;
        } elseif (! empty($charbuff)) {
            $charbuff .= $char;
        } else {
            $format_string .= $char;
            $append = true;
        }

        // do not add separator after the last character
        if ($append && ($i != $str_len - 1)) {
            $format_string .= $Separator;
        }
    }

    return $format_string;
}

/**
 * Function added to avoid path disclosures.
 * Called by each script that needs parameters, it displays
 * an error message and, by default, stops the execution.
 *
 * Not sure we could use a strMissingParameter message here,
 * would have to check if the error message file is always available
 *
 * @todo    use PMA_fatalError() if $die === true?
 * @param array  $params  The names of the parameters needed by the calling script.
 * @param bool   $die Stop the execution?
 *                  (Set this manually to false in the calling script
 *                   until you know all needed parameters to check).
 * @param bool   $request Whether to include this list in checking for special params.
 * @global  string  path to current script
 * @global  boolean flag whether any special variable was required
 *
 * @access  public
 */
function PMA_checkParameters($params, $die = true, $request = true)
{
    global $checked_special;

    if (! isset($checked_special)) {
        $checked_special = false;
    }

    $reported_script_name = basename($GLOBALS['PMA_PHP_SELF']);
    $found_error = false;
    $error_message = '';

    foreach ($params as $param) {
        if ($request && $param != 'db' && $param != 'table') {
            $checked_special = true;
        }

        if (! isset($GLOBALS[$param])) {
            $error_message .= $reported_script_name
                . ': ' . __('Missing parameter:') . ' '
                . $param
                . PMA_showDocu('faqmissingparameters')
                . '<br />';
            $found_error = true;
        }
    }
    if ($found_error) {
        /**
         * display html meta tags
         */
        require_once './libraries/header_meta_style.inc.php';
        echo '</head><body><p>' . $error_message . '</p></body></html>';
        if ($die) {
            exit();
        }
    }
} // end function

/**
 * Function to generate unique condition for specified row.
 *
 * @param resource    $handle         current query result
 * @param integer     $fields_cnt     number of fields
 * @param array       $fields_meta    meta information about fields
 * @param array       $row            current row
 * @param boolean     $force_unique   generate condition only on pk or unique
 *
 * @access  public
 *
 * @return  array     the calculated condition and whether condition is unique
 */
function PMA_getUniqueCondition($handle, $fields_cnt, $fields_meta, $row, $force_unique=false)
{
    $primary_key          = '';
    $unique_key           = '';
    $nonprimary_condition = '';
    $preferred_condition = '';
    $primary_key_array    = array();
    $unique_key_array     = array();
    $nonprimary_condition_array = array();
    $condition_array = array();

    for ($i = 0; $i < $fields_cnt; ++$i) {
        $condition   = '';
        $con_key     = '';
        $con_val     = '';
        $field_flags = PMA_DBI_field_flags($handle, $i);
        $meta        = $fields_meta[$i];

        // do not use a column alias in a condition
        if (! isset($meta->orgname) || ! strlen($meta->orgname)) {
            $meta->orgname = $meta->name;

            if (isset($GLOBALS['analyzed_sql'][0]['select_expr'])
                    && is_array($GLOBALS['analyzed_sql'][0]['select_expr'])) {
                foreach ($GLOBALS['analyzed_sql'][0]['select_expr'] as $select_expr) {
                    // need (string) === (string)
                    // '' !== 0 but '' == 0
                    if ((string) $select_expr['alias'] === (string) $meta->name) {
                        $meta->orgname = $select_expr['column'];
                        break;
                    } // end if
                } // end foreach
            }
        }

        // Do not use a table alias in a condition.
        // Test case is:
        // select * from galerie x WHERE
        //(select count(*) from galerie y where y.datum=x.datum)>1
        //
        // But orgtable is present only with mysqli extension so the
        // fix is only for mysqli.
        // Also, do not use the original table name if we are dealing with
        // a view because this view might be updatable.
        // (The isView() verification should not be costly in most cases
        // because there is some caching in the function).
        if (isset($meta->orgtable) && $meta->table != $meta->orgtable && ! PMA_Table::isView($GLOBALS['db'], $meta->table)) {
            $meta->table = $meta->orgtable;
        }

        // to fix the bug where float fields (primary or not)
        // can't be matched because of the imprecision of
        // floating comparison, use CONCAT
        // (also, the syntax "CONCAT(field) IS NULL"
        // that we need on the next "if" will work)
        if ($meta->type == 'real') {
            $con_key = 'CONCAT(' . PMA_backquote($meta->table) . '.'
                . PMA_backquote($meta->orgname) . ')';
        } else {
            $con_key = PMA_backquote($meta->table) . '.'
                . PMA_backquote($meta->orgname);
        } // end if... else...
        $condition = ' ' . $con_key . ' ';

        if (! isset($row[$i]) || is_null($row[$i])) {
            $con_val = 'IS NULL';
        } else {
            // timestamp is numeric on some MySQL 4.1
            // for real we use CONCAT above and it should compare to string
            if ($meta->numeric && $meta->type != 'timestamp' && $meta->type != 'real') {
                $con_val = '= ' . $row[$i];
            } elseif (($meta->type == 'blob' || $meta->type == 'string')
                // hexify only if this is a true not empty BLOB or a BINARY
                    && stristr($field_flags, 'BINARY')
                    && !empty($row[$i])) {
                // do not waste memory building a too big condition
                if (strlen($row[$i]) < 1000) {
                    // use a CAST if possible, to avoid problems
                    // if the field contains wildcard characters % or _
                    $con_val = '= CAST(0x' . bin2hex($row[$i]) . ' AS BINARY)';
                } else {
                    // this blob won't be part of the final condition
                    $con_val = null;
                }
            } elseif ($meta->type == 'bit') {
                $con_val = "= b'" . PMA_printable_bit_value($row[$i], $meta->length) . "'";
            } else {
                $con_val = '= \'' . PMA_sqlAddSlashes($row[$i], false, true) . '\'';
            }
        }
        if ($con_val != null) {
            $condition .= $con_val . ' AND';
            if ($meta->primary_key > 0) {
                $primary_key .= $condition;
                $primary_key_array[$con_key] = $con_val;
            } elseif ($meta->unique_key > 0) {
                $unique_key  .= $condition;
                $unique_key_array[$con_key] = $con_val;
            }
            $nonprimary_condition .= $condition;
            $nonprimary_condition_array[$con_key] = $con_val;
        }
    } // end for

    // Correction University of Virginia 19991216:
    // prefer primary or unique keys for condition,
    // but use conjunction of all values if no primary key
    $clause_is_unique = true;
    if ($primary_key) {
        $preferred_condition = $primary_key;
        $condition_array = $primary_key_array;
    } elseif ($unique_key) {
        $preferred_condition = $unique_key;
        $condition_array = $unique_key_array;
    } elseif (! $force_unique) {
        $preferred_condition = $nonprimary_condition;
        $condition_array = $nonprimary_condition_array;
        $clause_is_unique = false;
    }

    $where_clause = trim(preg_replace('|\s?AND$|', '', $preferred_condition));
    return(array($where_clause, $clause_is_unique, $condition_array));
} // end function

/**
 * Generate a button or image tag
 *
 * @param string  $button_name    name of button element
 * @param string  $button_class   class of button element
 * @param string  $image_name     name of image element
 * @param string  $text           text to display
 * @param string  $image          image to display
 * @param string  $value
 *
 * @access  public
 */
function PMA_buttonOrImage($button_name, $button_class, $image_name, $text,
    $image, $value = '')
{
    if ($value == '') {
        $value = $text;
    }
    if (false === $GLOBALS['cfg']['PropertiesIconic']) {
        echo ' <input type="submit" name="' . $button_name . '"'
                .' value="' . htmlspecialchars($value) . '"'
                .' title="' . htmlspecialchars($text) . '" />' . "\n";
        return;
    }

    /* Opera has trouble with <input type="image"> */
    /* IE has trouble with <button> */
    if (PMA_USR_BROWSER_AGENT != 'IE') {
        echo '<button class="' . $button_class . '" type="submit"'
            .' name="' . $button_name . '" value="' . htmlspecialchars($value) . '"'
            .' title="' . htmlspecialchars($text) . '">' . "\n"
            . PMA_getIcon($image, $text)
            .'</button>' . "\n";
    } else {
        echo '<input type="image" name="' . $image_name . '" value="'
            . htmlspecialchars($value) . '" title="' . htmlspecialchars($text) . '" src="' . $GLOBALS['pmaThemeImage']
            . $image . '" />'
            . ($GLOBALS['cfg']['PropertiesIconic'] === 'both' ? '&nbsp;' . htmlspecialchars($text) : '') . "\n";
    }
} // end function

/**
 * Generate a pagination selector for browsing resultsets
 *
 * @param int     $rows         Number of rows in the pagination set
 * @param int     $pageNow      current page number
 * @param int     $nbTotalPage  number of total pages
 * @param int     $showAll      If the number of pages is lower than this
 *                               variable, no pages will be omitted in pagination
 * @param int     $sliceStart   How many rows at the beginning should always be shown?
 * @param int     $sliceEnd     How many rows at the end should always be shown?
 * @param int     $percent      Percentage of calculation page offsets to hop to a next page
 * @param int     $range        Near the current page, how many pages should
 *                               be considered "nearby" and displayed as well?
 * @param string  $prompt       The prompt to display (sometimes empty)
 *
 * @return string
 *
 * @access  public
 */
function PMA_pageselector($rows, $pageNow = 1, $nbTotalPage = 1,
    $showAll = 200, $sliceStart = 5, $sliceEnd = 5, $percent = 20,
    $range = 10, $prompt = '')
{
    $increment = floor($nbTotalPage / $percent);
    $pageNowMinusRange = ($pageNow - $range);
    $pageNowPlusRange = ($pageNow + $range);

    $gotopage = $prompt . ' <select id="pageselector" ';
    if ($GLOBALS['cfg']['AjaxEnable']) {
        $gotopage .= ' class="ajax"';
    }
    $gotopage .= ' name="pos" >' . "\n";
    if ($nbTotalPage < $showAll) {
        $pages = range(1, $nbTotalPage);
    } else {
        $pages = array();

        // Always show first X pages
        for ($i = 1; $i <= $sliceStart; $i++) {
            $pages[] = $i;
        }

        // Always show last X pages
        for ($i = $nbTotalPage - $sliceEnd; $i <= $nbTotalPage; $i++) {
            $pages[] = $i;
        }

        // Based on the number of results we add the specified
        // $percent percentage to each page number,
        // so that we have a representing page number every now and then to
        // immediately jump to specific pages.
        // As soon as we get near our currently chosen page ($pageNow -
        // $range), every page number will be shown.
        $i = $sliceStart;
        $x = $nbTotalPage - $sliceEnd;
        $met_boundary = false;
        while ($i <= $x) {
            if ($i >= $pageNowMinusRange && $i <= $pageNowPlusRange) {
                // If our pageselector comes near the current page, we use 1
                // counter increments
                $i++;
                $met_boundary = true;
            } else {
                // We add the percentage increment to our current page to
                // hop to the next one in range
                $i += $increment;

                // Make sure that we do not cross our boundaries.
                if ($i > $pageNowMinusRange && ! $met_boundary) {
                    $i = $pageNowMinusRange;
                }
            }

            if ($i > 0 && $i <= $x) {
                $pages[] = $i;
            }
        }

        // Since because of ellipsing of the current page some numbers may be double,
        // we unify our array:
        sort($pages);
        $pages = array_unique($pages);
    }

    foreach ($pages as $i) {
        if ($i == $pageNow) {
            $selected = 'selected="selected" style="font-weight: bold"';
        } else {
            $selected = '';
        }
        $gotopage .= '                <option ' . $selected . ' value="' . (($i - 1) * $rows) . '">' . $i . '</option>' . "\n";
    }

    $gotopage .= ' </select><noscript><input type="submit" value="' . __('Go') . '" /></noscript>';

    return $gotopage;
} // end function


/**
 * Generate navigation for a list
 *
 * @todo    use $pos from $_url_params
 * @param int    $count        number of elements in the list
 * @param int    $pos          current position in the list
 * @param array  $_url_params  url parameters
 * @param string $script       script name for form target
 * @param string $frame        target frame
 * @param int    $max_count    maximum number of elements to display from the list
 *
 * @access  public
 */
function PMA_listNavigator($count, $pos, $_url_params, $script, $frame, $max_count)
{

    if ($max_count < $count) {
        echo 'frame_navigation' == $frame ? '<div id="navidbpageselector">' . "\n" : '';
        echo __('Page number:');
        echo 'frame_navigation' == $frame ? '<br />' : ' ';

        // Move to the beginning or to the previous page
        if ($pos > 0) {
            // patch #474210 - part 1
            if ($GLOBALS['cfg']['NavigationBarIconic']) {
                $caption1 = '&lt;&lt;';
                $caption2 = ' &lt; ';
                $title1   = ' title="' . _pgettext('First page', 'Begin') . '"';
                $title2   = ' title="' . _pgettext('Previous page', 'Previous') . '"';
            } else {
                $caption1 = _pgettext('First page', 'Begin') . ' &lt;&lt;';
                $caption2 = _pgettext('Previous page', 'Previous') . ' &lt;';
                $title1   = '';
                $title2   = '';
            } // end if... else...
            $_url_params['pos'] = 0;
            echo '<a' . $title1 . ' href="' . $script
                . PMA_generate_common_url($_url_params) . '" target="' . $frame . '">'
                . $caption1 . '</a>';
            $_url_params['pos'] = $pos - $max_count;
            echo '<a' . $title2 . ' href="' . $script
                . PMA_generate_common_url($_url_params) . '" target="' . $frame . '">'
                . $caption2 . '</a>';
        }

        echo "\n", '<form action="./', basename($script), '" method="post" target="', $frame, '">', "\n";
        echo PMA_generate_common_hidden_inputs($_url_params);
        echo PMA_pageselector(
                $max_count,
                floor(($pos + 1) / $max_count) + 1,
                ceil($count / $max_count));
        echo '</form>';

        if ($pos + $max_count < $count) {
            if ($GLOBALS['cfg']['NavigationBarIconic']) {
                $caption3 = ' &gt; ';
                $caption4 = '&gt;&gt;';
                $title3   = ' title="' . _pgettext('Next page', 'Next') . '"';
                $title4   = ' title="' . _pgettext('Last page', 'End') . '"';
            } else {
                $caption3 = '&gt; ' . _pgettext('Next page', 'Next');
                $caption4 = '&gt;&gt; ' . _pgettext('Last page', 'End');
                $title3   = '';
                $title4   = '';
            } // end if... else...
            $_url_params['pos'] = $pos + $max_count;
            echo '<a' . $title3 . ' href="' . $script
                . PMA_generate_common_url($_url_params) . '" target="' . $frame . '">'
                . $caption3 . '</a>';
            $_url_params['pos'] = floor($count / $max_count) * $max_count;
            if ($_url_params['pos'] == $count) {
                $_url_params['pos'] = $count - $max_count;
            }
            echo '<a' . $title4 . ' href="' . $script
                . PMA_generate_common_url($_url_params) . '" target="' . $frame . '">'
                . $caption4 . '</a>';
        }
        echo "\n";
        if ('frame_navigation' == $frame) {
            echo '</div>' . "\n";
        }
    }
}

/**
 * replaces %u in given path with current user name
 *
 * example:
 * <code>
 * $user_dir = PMA_userDir('/var/pma_tmp/%u/'); // '/var/pma_tmp/root/'
 *
 * </code>
 *
 * @param string  $dir with wildcard for user
 *
 * @return  string  per user directory
 */
function PMA_userDir($dir)
{
    // add trailing slash
    if (substr($dir, -1) != '/') {
        $dir .= '/';
    }

    return str_replace('%u', $GLOBALS['cfg']['Server']['user'], $dir);
}

/**
 * returns html code for db link to default db page
 *
 * @param string  $database
 *
 * @return  string  html link to default db page
 */
function PMA_getDbLink($database = null)
{
    if (! strlen($database)) {
        if (! strlen($GLOBALS['db'])) {
            return '';
        }
        $database = $GLOBALS['db'];
    } else {
        $database = PMA_unescape_mysql_wildcards($database);
    }

    return '<a href="' . $GLOBALS['cfg']['DefaultTabDatabase'] . '?' . PMA_generate_common_url($database) . '"'
        .' title="' . sprintf(__('Jump to database &quot;%s&quot;.'), htmlspecialchars($database)) . '">'
        .htmlspecialchars($database) . '</a>';
}

/**
 * Displays a lightbulb hint explaining a known external bug
 * that affects a functionality
 *
 * @param string  $functionality localized message explaining the func.
 * @param string  $component  'mysql' (eventually, 'php')
 * @param string  $minimum_version of this component
 * @param string  $bugref  bug reference for this component
 */
function PMA_externalBug($functionality, $component, $minimum_version, $bugref)
{
    if ($component == 'mysql' && PMA_MYSQL_INT_VERSION < $minimum_version) {
        echo PMA_showHint(sprintf(__('The %s functionality is affected by a known bug, see %s'), $functionality, PMA_linkURL('http://bugs.mysql.com/') . $bugref));
    }
}

/**
 * Generates and echoes an HTML checkbox
 *
 * @param string  $html_field_name the checkbox HTML field
 * @param string  $label           label for checkbox
 * @param boolean $checked         is it initially checked?
 * @param boolean $onclick         should it submit the form on click?
 */
function PMA_display_html_checkbox($html_field_name, $label, $checked, $onclick)
{

    echo '<input type="checkbox" name="' . $html_field_name . '" id="' . $html_field_name . '"' . ($checked ? ' checked="checked"' : '') . ($onclick ? ' class="autosubmit"' : '') . ' /><label for="' . $html_field_name . '">' . $label . '</label>';
}

/**
 * Generates and echoes a set of radio HTML fields
 *
 * @param string  $html_field_name the radio HTML field
 * @param array   $choices         the choices values and labels
 * @param string  $checked_choice  the choice to check by default
 * @param boolean $line_break      whether to add an HTML line break after a choice
 * @param boolean $escape_label    whether to use htmlspecialchars() on label
 * @param string  $class           enclose each choice with a div of this class
 */
function PMA_display_html_radio($html_field_name, $choices, $checked_choice = '', $line_break = true, $escape_label = true, $class='')
{
    foreach ($choices as $choice_value => $choice_label) {
        if (! empty($class)) {
            echo '<div class="' . $class . '">';
        }
        $html_field_id = $html_field_name . '_' . $choice_value;
        echo '<input type="radio" name="' . $html_field_name . '" id="' . $html_field_id . '" value="' . htmlspecialchars($choice_value) . '"';
        if ($choice_value == $checked_choice) {
            echo ' checked="checked"';
        }
        echo ' />' . "\n";
        echo '<label for="' . $html_field_id . '">' . ($escape_label ? htmlspecialchars($choice_label)  : $choice_label) . '</label>';
        if ($line_break) {
            echo '<br />';
        }
        if (! empty($class)) {
            echo '</div>';
        }
        echo "\n";
    }
}

/**
 * Generates and returns an HTML dropdown
 *
 * @param string  $select_name
 * @param array   $choices        choices values
 * @param string  $active_choice  the choice to select by default
 * @param string  $id             id of the select element; can be different in case
 *                                  the dropdown is present more than once on the page
 * @return string
 *
 * @todo    support titles
 */
function PMA_generate_html_dropdown($select_name, $choices, $active_choice, $id)
{
    $result = '<select name="' . htmlspecialchars($select_name) . '" id="' . htmlspecialchars($id) . '">';
    foreach ($choices as $one_choice_value => $one_choice_label) {
        $result .= '<option value="' . htmlspecialchars($one_choice_value) . '"';
        if ($one_choice_value == $active_choice) {
            $result .= ' selected="selected"';
        }
        $result .= '>' . htmlspecialchars($one_choice_label) . '</option>';
    }
    $result .= '</select>';
    return $result;
}

/**
 * Generates a slider effect (jQjuery)
 * Takes care of generating the initial <div> and the link
 * controlling the slider; you have to generate the </div> yourself
 * after the sliding section.
 *
 * @param string  $id the id of the <div> on which to apply the effect
 * @param string  $message the message to show as a link
 */
function PMA_generate_slider_effect($id, $message)
{
    if ($GLOBALS['cfg']['InitialSlidersState'] == 'disabled') {
        echo '<div id="' . $id . '">';
        return;
    }
    /**
     * Bad hack on the next line. document.write() conflicts with jQuery, hence,
     * opening the <div> with PHP itself instead of JavaScript.
     *
     * @todo find a better solution that uses $.append(), the recommended method
     * maybe by using an additional param, the id of the div to append to
     */
    ?>
<div id="<?php echo $id; ?>" <?php echo $GLOBALS['cfg']['InitialSlidersState'] == 'closed' ? ' style="display: none; overflow:auto;"' : ''; ?> class="pma_auto_slider" title="<?php echo htmlspecialchars($message); ?>">
    <?php
}

/**
 * Creates an AJAX sliding toggle button (or and equivalent form when AJAX is disabled)
 *
 * @param string   $action        The URL for the request to be executed
 * @param string   $select_name   The name for the dropdown box
 * @param array    $options       An array of options (see rte_footer.lib.php)
 * @param string   $callback      A JS snippet to execute when the request is
 *                                   successfully processed
 *
 * @return   string   HTML code for the toggle button
 */
function PMA_toggleButton($action, $select_name, $options, $callback)
{
    // Do the logic first
    $link_on = "$action&amp;$select_name=" . urlencode($options[1]['value']);
    $link_off = "$action&amp;$select_name=" . urlencode($options[0]['value']);
    if ($options[1]['selected'] == true) {
        $state = 'on';
    } else if ($options[0]['selected'] == true) {
        $state = 'off';
    } else {
        $state = 'on';
    }
    $selected1 = '';
    $selected0 = '';
    if ($options[1]['selected'] == true) {
        $selected1 = " selected='selected'";
    } else if ($options[0]['selected'] == true) {
        $selected0 = " selected='selected'";
    }
    // Generate output
    $retval  = "<!-- TOGGLE START -->\n";
    if ($GLOBALS['cfg']['AjaxEnable']) {
        $retval .= "<noscript>\n";
    }
    $retval .= "<div class='wrapper'>\n";
    $retval .= "    <form action='$action' method='post'>\n";
    $retval .= "        <select name='$select_name'>\n";
    $retval .= "            <option value='{$options[1]['value']}'$selected1>";
    $retval .= "                {$options[1]['label']}\n";
    $retval .= "            </option>\n";
    $retval .= "            <option value='{$options[0]['value']}'$selected0>";
    $retval .= "                {$options[0]['label']}\n";
    $retval .= "            </option>\n";
    $retval .= "        </select>\n";
    $retval .= "        <input type='submit' value='" . __('Change') . "'/>\n";
    $retval .= "    </form>\n";
    $retval .= "</div>\n";
    if ($GLOBALS['cfg']['AjaxEnable']) {
        $retval .= "</noscript>\n";
        $retval .= "<div class='wrapper toggleAjax hide'>\n";
        $retval .= "    <div class='toggleButton'>\n";
        $retval .= "        <div title='" . __('Click to toggle') . "' class='container $state'>\n";
        $retval .= "            <img src='{$GLOBALS['pmaThemeImage']}toggle-{$GLOBALS['text_dir']}.png'\n";
        $retval .= "                 alt='' />\n";
        $retval .= "            <table cellspacing='0' cellpadding='0'><tr>\n";
        $retval .= "                <tbody>\n";
        $retval .= "                <td class='toggleOn'>\n";
        $retval .= "                    <span class='hide'>$link_on</span>\n";
        $retval .= "                    <div>";
        $retval .= str_replace(' ', '&nbsp;', $options[1]['label']) . "</div>\n";
        $retval .= "                </td>\n";
        $retval .= "                <td><div>&nbsp;</div></td>\n";
        $retval .= "                <td class='toggleOff'>\n";
        $retval .= "                    <span class='hide'>$link_off</span>\n";
        $retval .= "                    <div>";
        $retval .= str_replace(' ', '&nbsp;', $options[0]['label']) . "</div>\n";
        $retval .= "                    </div>\n";
        $retval .= "                </tbody>\n";
        $retval .= "            </tr></table>\n";
        $retval .= "            <span class='hide callback'>$callback</span>\n";
        $retval .= "            <span class='hide text_direction'>{$GLOBALS['text_dir']}</span>\n";
        $retval .= "        </div>\n";
        $retval .= "    </div>\n";
        $retval .= "</div>\n";
    }
    $retval .= "<!-- TOGGLE END -->";

    return $retval;
} // end PMA_toggleButton()

/**
 * Clears cache content which needs to be refreshed on user change.
 */
function PMA_clearUserCache()
{
    PMA_cacheUnset('is_superuser', true);
}

/**
 * Verifies if something is cached in the session
 *
 * @param string   $var
 * @param int|true $server
 *
 * @return boolean
 */
function PMA_cacheExists($var, $server = 0)
{
    if (true === $server) {
        $server = $GLOBALS['server'];
    }
    return isset($_SESSION['cache']['server_' . $server][$var]);
}

/**
 * Gets cached information from the session
 *
 * @param string   $var
 * @param int|true $server
 *
 * @return mixed
 */
function PMA_cacheGet($var, $server = 0)
{
    if (true === $server) {
        $server = $GLOBALS['server'];
    }
    if (isset($_SESSION['cache']['server_' . $server][$var])) {
        return $_SESSION['cache']['server_' . $server][$var];
    } else {
        return null;
    }
}

/**
 * Caches information in the session
 *
 * @param string   $var
 * @param mixed    $val
 * @param int|true $server
 *
 * @return mixed
 */
function PMA_cacheSet($var, $val = null, $server = 0)
{
    if (true === $server) {
        $server = $GLOBALS['server'];
    }
    $_SESSION['cache']['server_' . $server][$var] = $val;
}

/**
 * Removes cached information from the session
 *
 * @param string   $var
 * @param int|true $server
 */
function PMA_cacheUnset($var, $server = 0)
{
    if (true === $server) {
        $server = $GLOBALS['server'];
    }
    unset($_SESSION['cache']['server_' . $server][$var]);
}

/**
 * Converts a bit value to printable format;
 * in MySQL a BIT field can be from 1 to 64 bits so we need this
 * function because in PHP, decbin() supports only 32 bits
 *
 * @param numeric $value coming from a BIT field
 * @param integer $length
 *
 * @return  string  the printable value
 */
function PMA_printable_bit_value($value, $length)
{
    $printable = '';
    for ($i = 0, $len_ceiled = ceil($length / 8); $i < $len_ceiled; $i++) {
        $printable .= sprintf('%08d', decbin(ord(substr($value, $i, 1))));
    }
    $printable = substr($printable, -$length);
    return $printable;
}

/**
 * Verifies whether the value contains a non-printable character
 *
 * @param string $value
 *
 * @return  boolean
 */
function PMA_contains_nonprintable_ascii($value)
{
    return preg_match('@[^[:print:]]@', $value);
}

/**
 * Converts a BIT type default value
 * for example, b'010' becomes 010
 *
 * @param string $bit_default_value
 *
 * @return  string the converted value
 */
function PMA_convert_bit_default_value($bit_default_value)
{
    return strtr($bit_default_value, array("b" => "", "'" => ""));
}

/**
 * Extracts the various parts from a field type spec
 *
 * @param string $fieldspec
 *
 * @return  array associative array containing type, spec_in_brackets
 *          and possibly enum_set_values (another array)
 */
function PMA_extractFieldSpec($fieldspec)
{
    $first_bracket_pos = strpos($fieldspec, '(');
    if ($first_bracket_pos) {
        $spec_in_brackets = chop(substr($fieldspec, $first_bracket_pos + 1, (strrpos($fieldspec, ')') - $first_bracket_pos - 1)));
        // convert to lowercase just to be sure
        $type = strtolower(chop(substr($fieldspec, 0, $first_bracket_pos)));
    } else {
        $type = strtolower($fieldspec);
        $spec_in_brackets = '';
    }

    if ('enum' == $type || 'set' == $type) {
        // Define our working vars
        $enum_set_values = array();
        $working = "";
        $in_string = false;
        $index = 0;

        // While there is another character to process
        while (isset($fieldspec[$index])) {
            // Grab the char to look at
            $char = $fieldspec[$index];

            // If it is a single quote, needs to be handled specially
            if ($char == "'") {
                // If we are not currently in a string, begin one
                if (! $in_string) {
                    $in_string = true;
                    $working = "";
                } else {
                    // Otherwise, it may be either an end of a string, or a 'double quote' which can be handled as-is
                    // Check out the next character (if possible)
                    $has_next = isset($fieldspec[$index + 1]);
                    $next = $has_next ? $fieldspec[$index + 1] : null;

                    // If we have reached the end of our 'working' string (because there are no more chars, or the next char is not another quote)
                    if (! $has_next || $next != "'") {
                        $enum_set_values[] = $working;
                        $in_string = false;

                    // Otherwise, this is a 'double quote', and can be added to the working string
                    } elseif ($next == "'") {
                        $working .= "'";
                        // Skip the next char; we already know what it is
                        $index++;
                    }
                }
            } elseif ('\\' == $char && isset($fieldspec[$index + 1]) && "'" == $fieldspec[$index + 1]) {
                // escaping of a quote?
                $working .= "'";
                $index++;
            } else {
                // Otherwise, add it to our working string like normal
                $working .= $char;
            }
            // Increment character index
            $index++;
        } // end while
        $printtype = $type . '(' .  str_replace("','", "', '", $spec_in_brackets) . ')';
        $binary = false;
        $unsigned = false;
        $zerofill = false;
    } else {
        $enum_set_values = array();

        /* Create printable type name */
        $printtype = strtolower($fieldspec);

        // strip the "BINARY" attribute, except if we find "BINARY(" because
        // this would be a BINARY or VARBINARY field type
        if (!preg_match('@binary[\(]@', $printtype)) {
            $binary = strpos($printtype, 'blob') !== false || strpos($printtype, 'binary') !== false;
            $printtype = preg_replace('@binary@', '', $printtype);
        } else {
            $binary = false;
        }
        $printtype = preg_replace('@zerofill@', '', $printtype, -1, $zerofill_cnt);
        $zerofill = ($zerofill_cnt > 0);
        $printtype = preg_replace('@unsigned@', '', $printtype, -1, $unsigned_cnt);
        $unsigned = ($unsigned_cnt > 0);
        $printtype = trim($printtype);

    }

    $attribute     = ' ';
    if ($binary) {
        $attribute = 'BINARY';
    }
    if ($unsigned) {
        $attribute = 'UNSIGNED';
    }
    if ($zerofill) {
        $attribute = 'UNSIGNED ZEROFILL';
    }

    return array(
        'type' => $type,
        'spec_in_brackets' => $spec_in_brackets,
        'enum_set_values'  => $enum_set_values,
        'print_type' => $printtype,
        'binary' => $binary,
        'unsigned' => $unsigned,
        'zerofill' => $zerofill,
        'attribute' => $attribute,
    );
}

/**
 * Verifies if this table's engine supports foreign keys
 *
 * @param string $engine
 *
 * @return  boolean
 */
function PMA_foreignkey_supported($engine)
{
    $engine = strtoupper($engine);
    if ('INNODB' == $engine || 'PBXT' == $engine) {
        return true;
    } else {
        return false;
    }
}

/**
 * Replaces some characters by a displayable equivalent
 *
 * @param string $content
 *
 * @return  string the content with characters replaced
 */
function PMA_replace_binary_contents($content)
{
    $result = str_replace("\x00", '\0', $content);
    $result = str_replace("\x08", '\b', $result);
    $result = str_replace("\x0a", '\n', $result);
    $result = str_replace("\x0d", '\r', $result);
    $result = str_replace("\x1a", '\Z', $result);
    return $result;
}

/**
 * If the string starts with a \r\n pair (0x0d0a) add an extra \n
 *
 * @param string $string
 *
 * @return  string with the chars replaced
 */

function PMA_duplicateFirstNewline($string)
{
    $first_occurence = strpos($string, "\r\n");
    if ($first_occurence === 0) {
        $string = "\n".$string;
    }
    return $string;
}

/**
 * Get the action word corresponding to a script name
 * in order to display it as a title in navigation panel
 *
 * @param string $target  a valid value for $cfg['LeftDefaultTabTable'], $cfg['DefaultTabTable']
 *                        or $cfg['DefaultTabDatabase']
 *
 * @return array
 */
function PMA_getTitleForTarget($target)
{
    $mapping = array(
        // Values for $cfg['DefaultTabTable']
        'tbl_structure.php' =>  __('Structure'),
        'tbl_sql.php' => __('SQL'),
        'tbl_select.php' =>__('Search'),
        'tbl_change.php' =>__('Insert'),
        'sql.php' => __('Browse'),

        // Values for $cfg['DefaultTabDatabase']
        'db_structure.php' => __('Structure'),
        'db_sql.php' => __('SQL'),
        'db_search.php' => __('Search'),
        'db_operations.php' => __('Operations'),
    );
    return $mapping[$target];
}

/**
 * Formats user string, expading @VARIABLES@, accepting strftime format string.
 *
 * @param string    $string  Text where to do expansion.
 * @param function  $escape  Function to call for escaping variable values.
 * @param array     $updates Array with overrides for default parameters (obtained from GLOBALS).
 *
 * @return string
 */
function PMA_expandUserString($string, $escape = null, $updates = array())
{
    /* Content */
    $vars['http_host'] = PMA_getenv('HTTP_HOST') ? PMA_getenv('HTTP_HOST') : '';
    $vars['server_name'] = $GLOBALS['cfg']['Server']['host'];
    $vars['server_verbose'] = $GLOBALS['cfg']['Server']['verbose'];
    $vars['server_verbose_or_name'] = !empty($GLOBALS['cfg']['Server']['verbose']) ? $GLOBALS['cfg']['Server']['verbose'] : $GLOBALS['cfg']['Server']['host'];
    $vars['database'] = $GLOBALS['db'];
    $vars['table'] = $GLOBALS['table'];
    $vars['phpmyadmin_version'] = 'phpMyAdmin ' . PMA_VERSION;

    /* Update forced variables */
    foreach ($updates as $key => $val) {
        $vars[$key] = $val;
    }

    /* Replacement mapping */
    /*
     * The __VAR__ ones are for backward compatibility, because user
     * might still have it in cookies.
     */
    $replace = array(
        '@HTTP_HOST@' => $vars['http_host'],
        '@SERVER@' => $vars['server_name'],
        '__SERVER__' => $vars['server_name'],
        '@VERBOSE@' => $vars['server_verbose'],
        '@VSERVER@' => $vars['server_verbose_or_name'],
        '@DATABASE@' => $vars['database'],
        '__DB__' => $vars['database'],
        '@TABLE@' => $vars['table'],
        '__TABLE__' => $vars['table'],
        '@PHPMYADMIN@' => $vars['phpmyadmin_version'],
        );

    /* Optional escaping */
    if (!is_null($escape)) {
        foreach ($replace as $key => $val) {
            $replace[$key] = $escape($val);
        }
    }

    /* Fetch fields list if required */
    if (strpos($string, '@FIELDS@') !== false) {
        $fields_list = PMA_DBI_get_columns($GLOBALS['db'], $GLOBALS['table']);

        $field_names = array();
        foreach ($fields_list as $field) {
            if (!is_null($escape)) {
                $field_names[] = $escape($field['Field']);
            } else {
                $field_names[] = $field['Field'];
            }
        }

        $replace['@FIELDS@'] = implode(',', $field_names);
    }

    /* Do the replacement */
    return strtr(strftime($string), $replace);
}

/**
 * function that generates a json output for an ajax request and ends script
 * execution
 *
 * @param bool   $message     message string containing the html of the message
 * @param bool   $success success whether the ajax request was successfull
 * @param array  $extra_data  extra_data  optional - any other data as part of the json request
 *
 */
function PMA_ajaxResponse($message, $success = true, $extra_data = array())
{
    $response = array();
    if ( $success == true ) {
        $response['success'] = true;
        if ($message instanceof PMA_Message) {
            $response['message'] = $message->getDisplay();
        }
        else {
            $response['message'] = $message;
        }
    }
    else {
        $response['success'] = false;
        if ($message instanceof PMA_Message) {
            $response['error'] = $message->getDisplay();
        }
        else {
            $response['error'] = $message;
        }
    }

    // If extra_data has been provided, append it to the response array
    if ( ! empty($extra_data) && count($extra_data) > 0 ) {
        $response = array_merge($response, $extra_data);
    }

    // Set the Content-Type header to JSON so that jQuery parses the
    // response correctly.
    //
    // At this point, other headers might have been sent;
    // even if $GLOBALS['is_header_sent'] is true,
    // we have to send these additional headers.
    header('Cache-Control: no-cache');
    header("Content-Type: application/json");

    echo json_encode($response);

    if (!defined('TESTSUITE'))
        exit;
}

/**
 * Display the form used to browse anywhere on the local server for the file to import
 *
 * @param $max_upload_size
 */
function PMA_browseUploadFile($max_upload_size)
{
    echo '<label for="radio_import_file">' . __("Browse your computer:") . '</label>';
    echo '<div id="upload_form_status" style="display: none;"></div>';
    echo '<div id="upload_form_status_info" style="display: none;"></div>';
    echo '<input type="file" name="import_file" id="input_import_file" />';
    echo PMA_displayMaximumUploadSize($max_upload_size) . "\n";
    // some browsers should respect this :)
    echo PMA_generateHiddenMaxFileSize($max_upload_size) . "\n";
}

/**
 * Display the form used to select a file to import from the server upload directory
 *
 * @param $import_list
 * @param $uploaddir
 */
function PMA_selectUploadFile($import_list, $uploaddir)
{
    echo '<label for="radio_local_import_file">' . sprintf(__("Select from the web server upload directory <b>%s</b>:"), htmlspecialchars(PMA_userDir($uploaddir))) . '</label>';
    $extensions = '';
    foreach ($import_list as $key => $val) {
        if (!empty($extensions)) {
            $extensions .= '|';
        }
        $extensions .= $val['extension'];
    }
    $matcher = '@\.(' . $extensions . ')(\.(' . PMA_supportedDecompressions() . '))?$@';

    $files = PMA_getFileSelectOptions(PMA_userDir($uploaddir), $matcher, (isset($timeout_passed) && $timeout_passed && isset($local_import_file)) ? $local_import_file : '');
    if ($files === false) {
        PMA_Message::error(__('The directory you set for upload work cannot be reached'))->display();
    } elseif (!empty($files)) {
        echo "\n";
        echo '    <select style="margin: 5px" size="1" name="local_import_file" id="select_local_import_file">' . "\n";
        echo '        <option value="">&nbsp;</option>' . "\n";
        echo $files;
        echo '    </select>' . "\n";
    } elseif (empty ($files)) {
        echo '<i>' . __('There are no files to upload') . '</i>';
    }
}

/**
 * Build titles and icons for action links
 *
 * @return   array   the action titles
 */
function PMA_buildActionTitles()
{
    $titles = array();

    $titles['Browse']     = PMA_getIcon('b_browse.png', __('Browse'));
    $titles['NoBrowse']   = PMA_getIcon('bd_browse.png', __('Browse'));
    $titles['Search']     = PMA_getIcon('b_select.png', __('Search'));
    $titles['NoSearch']   = PMA_getIcon('bd_select.png', __('Search'));
    $titles['Insert']     = PMA_getIcon('b_insrow.png', __('Insert'));
    $titles['NoInsert']   = PMA_getIcon('bd_insrow.png', __('Insert'));
    $titles['Structure']  = PMA_getIcon('b_props.png', __('Structure'));
    $titles['Drop']       = PMA_getIcon('b_drop.png', __('Drop'));
    $titles['NoDrop']     = PMA_getIcon('bd_drop.png', __('Drop'));
    $titles['Empty']      = PMA_getIcon('b_empty.png', __('Empty'));
    $titles['NoEmpty']    = PMA_getIcon('bd_empty.png', __('Empty'));
    $titles['Edit']       = PMA_getIcon('b_edit.png', __('Edit'));
    $titles['NoEdit']     = PMA_getIcon('bd_edit.png', __('Edit'));
    $titles['Export']     = PMA_getIcon('b_export.png', __('Export'));
    $titles['NoExport']   = PMA_getIcon('bd_export.png', __('Export'));
    $titles['Execute']    = PMA_getIcon('b_nextpage.png', __('Execute'));
    $titles['NoExecute']  = PMA_getIcon('bd_nextpage.png', __('Execute'));
    return $titles;
}

/**
 * This function processes the datatypes supported by the DB, as specified in
 * $cfg['ColumnTypes'] and either returns an array (useful for quickly checking
 * if a datatype is supported) or an HTML snippet that creates a drop-down list.
 *
 * @param bool    $html       Whether to generate an html snippet or an array
 * @param string  $selected   The value to mark as selected in HTML mode
 *
 * @return  mixed   An HTML snippet or an array of datatypes.
 *
 */
function PMA_getSupportedDatatypes($html = false, $selected = '')
{
    global $cfg;

    if ($html) {
        // NOTE: the SELECT tag in not included in this snippet.
        $retval = '';
        foreach ($cfg['ColumnTypes'] as $key => $value) {
            if (is_array($value)) {
                $retval .= "<optgroup label='" . htmlspecialchars($key) . "'>";
                foreach ($value as $subvalue) {
                    if ($subvalue == $selected) {
                        $retval .= "<option selected='selected'>";
                        $retval .= $subvalue;
                        $retval .= "</option>";
                    } else if ($subvalue === '-') {
                        $retval .= "<option disabled='disabled'>";
                        $retval .= $subvalue;
                        $retval .= "</option>";
                    } else {
                        $retval .= "<option>$subvalue</option>";
                    }
                }
                $retval .= '</optgroup>';
            } else {
                if ($selected == $value) {
                    $retval .= "<option selected='selected'>$value</option>";
                } else {
                    $retval .= "<option>$value</option>";
                }
            }
        }
    } else {
        $retval = array();
        foreach ($cfg['ColumnTypes'] as $value) {
            if (is_array($value)) {
                foreach ($value as $subvalue) {
                    if ($subvalue !== '-') {
                        $retval[] = $subvalue;
                    }
                }
            } else {
                if ($value !== '-') {
                    $retval[] = $value;
                }
            }
        }
    }

    return $retval;
} // end PMA_getSupportedDatatypes()

/**
 * Returns a list of datatypes that are not (yet) handled by PMA.
 * Used by: tbl_change.php and libraries/db_routines.inc.php
 *
 * @return   array   list of datatypes
 */

function PMA_unsupportedDatatypes()
{
    // These GIS data types are not yet supported.
    $no_support_types = array('geometry',
                              'point',
                              'linestring',
                              'polygon',
                              'multipoint',
                              'multilinestring',
                              'multipolygon',
                              'geometrycollection'
                        );

    return $no_support_types;
}

/**
 * Creates a dropdown box with MySQL functions for a particular column.
 *
 * @param array    $field          Data about the column for which
 *                                    to generate the dropdown
 * @param bool     $insert_mode    Whether the operation is 'insert'
 *
 * @global   array    $cfg            PMA configuration
 * @global   array    $analyzed_sql   Analyzed SQL query
 * @global   mixed    $data           (null/string) FIXME: what is this for?
 *
 * @return   string   An HTML snippet of a dropdown list with function
 *                    names appropriate for the requested column.
 */
function PMA_getFunctionsForField($field, $insert_mode)
{
    global $cfg, $analyzed_sql, $data;

    $selected = '';
    // Find the current type in the RestrictColumnTypes. Will result in 'FUNC_CHAR'
    // or something similar. Then directly look up the entry in the RestrictFunctions array,
    // which will then reveal the available dropdown options
    if (isset($cfg['RestrictColumnTypes'][strtoupper($field['True_Type'])])
     && isset($cfg['RestrictFunctions'][$cfg['RestrictColumnTypes'][strtoupper($field['True_Type'])]])) {
        $current_func_type  = $cfg['RestrictColumnTypes'][strtoupper($field['True_Type'])];
        $dropdown           = $cfg['RestrictFunctions'][$current_func_type];
        $default_function   = $cfg['DefaultFunctions'][$current_func_type];
    } else {
        $dropdown = array();
        $default_function   = '';
    }
    $dropdown_built = array();
    $op_spacing_needed = false;
    // what function defined as default?
    // for the first timestamp we don't set the default function
    // if there is a default value for the timestamp
    // (not including CURRENT_TIMESTAMP)
    // and the column does not have the
    // ON UPDATE DEFAULT TIMESTAMP attribute.
    if ($field['True_Type'] == 'timestamp'
      && empty($field['Default'])
      && empty($data)
      && ! isset($analyzed_sql[0]['create_table_fields'][$field['Field']]['on_update_current_timestamp'])) {
        $default_function = $cfg['DefaultFunctions']['first_timestamp'];
    }
    // For primary keys of type char(36) or varchar(36) UUID if the default function
    // Only applies to insert mode, as it would silently trash data on updates.
    if ($insert_mode
        && $field['Key'] == 'PRI'
        && ($field['Type'] == 'char(36)' || $field['Type'] == 'varchar(36)')
    ) {
         $default_function = $cfg['DefaultFunctions']['FUNC_UUID'];
    }
    // this is set only when appropriate and is always true
    if (isset($field['display_binary_as_hex'])) {
        $default_function = 'UNHEX';
    }

    // Create the output
    $retval = '                <option></option>' . "\n";
    // loop on the dropdown array and print all available options for that field.
    foreach ($dropdown as $each_dropdown) {
        $retval .= '                ';
        $retval .= '<option';
        if ($default_function === $each_dropdown) {
            $retval .= ' selected="selected"';
        }
        $retval .= '>' . $each_dropdown . '</option>' . "\n";
        $dropdown_built[$each_dropdown] = 'true';
        $op_spacing_needed = true;
    }
    // For compatibility's sake, do not let out all other functions. Instead
    // print a separator (blank) and then show ALL functions which weren't shown
    // yet.
    $cnt_functions = count($cfg['Functions']);
    for ($j = 0; $j < $cnt_functions; $j++) {
        if (! isset($dropdown_built[$cfg['Functions'][$j]]) || $dropdown_built[$cfg['Functions'][$j]] != 'true') {
            // Is current function defined as default?
            $selected = ($field['first_timestamp'] && $cfg['Functions'][$j] == $cfg['DefaultFunctions']['first_timestamp'])
                        || (!$field['first_timestamp'] && $cfg['Functions'][$j] == $default_function)
                      ? ' selected="selected"'
                      : '';
            if ($op_spacing_needed == true) {
                $retval .= '                ';
                $retval .= '<option value="">--------</option>' . "\n";
                $op_spacing_needed = false;
            }

            $retval .= '                ';
            $retval .= '<option' . $selected . '>' . $cfg['Functions'][$j] . '</option>' . "\n";
        }
    } // end for

    return $retval;
} // end PMA_getFunctionsForField()

/**
 * Checks if the current user has a specific privilege and returns true if the
 * user indeed has that privilege or false if (s)he doesn't. This function must
 * only be used for features that are available since MySQL 5, because it
 * relies on the INFORMATION_SCHEMA database to be present.
 *
 * Example:   PMA_currentUserHasPrivilege('CREATE ROUTINE', 'mydb');
 *            // Checks if the currently logged in user has the global
 *            // 'CREATE ROUTINE' privilege or, if not, checks if the
 *            // user has this privilege on database 'mydb'.
 *
 *
 * @param string   $priv   The privilege to check
 * @param mixed    $db     null, to only check global privileges
 *                           string, db name where to also check for privileges
 * @param mixed    $tbl    null, to only check global privileges
 *                           string, db name where to also check for privileges
 *
 * @return bool
 */
function PMA_currentUserHasPrivilege($priv, $db = null, $tbl = null)
{
    // Get the username for the current user in the format
    // required to use in the information schema database.
    $user = PMA_DBI_fetch_value("SELECT CURRENT_USER();");
    if ($user === false) {
        return false;
    }
    $user = explode('@', $user);
    $username  = "''";
    $username .= str_replace("'", "''", $user[0]);
    $username .= "''@''";
    $username .= str_replace("'", "''", $user[1]);
    $username .= "''";
    // Prepage the query
    $query = "SELECT `PRIVILEGE_TYPE` FROM `INFORMATION_SCHEMA`.`%s` "
           . "WHERE GRANTEE='%s' AND PRIVILEGE_TYPE='%s'";
    // Check global privileges first.
    if (PMA_DBI_fetch_value(sprintf($query,
                                    'USER_PRIVILEGES',
                                    $username,
                                    $priv))) {
        return true;
    }
    // If a database name was provided and user does not have the
    // required global privilege, try database-wise permissions.
    if ($db !== null) {
        $query .= " AND TABLE_SCHEMA='%s'";
        if (PMA_DBI_fetch_value(sprintf($query,
                                        'SCHEMA_PRIVILEGES',
                                        $username,
                                        $priv,
                                        PMA_sqlAddSlashes($db)))) {
            return true;
        }
    } else {
        // There was no database name provided and the user
        // does not have the correct global privilege.
        return false;
    }
    // If a table name was also provided and we still didn't
    // find any valid privileges, try table-wise privileges.
    if ($tbl !== null) {
        $query .= " AND TABLE_NAME='%s'";
        if ($retval = PMA_DBI_fetch_value(sprintf($query,
                                                  'TABLE_PRIVILEGES',
                                                  $username,
                                                  $priv,
                                                  PMA_sqlAddSlashes($db),
                                                  PMA_sqlAddSlashes($tbl)))) {
            return true;
        }
    }
    // If we reached this point, the user does not
    // have even valid table-wise privileges.
    return false;
}

/**
 * Returns server type for current connection
 *
 * Known types are: Drizzle, MariaDB and MySQL (default)
 *
 * @return string
 */
function PMA_getServerType()
{
    $server_type = 'MySQL';
    if (PMA_DRIZZLE) {
        $server_type = 'Drizzle';
    } else if (strpos(PMA_MYSQL_STR_VERSION, 'mariadb') !== false) {
        $server_type = 'MariaDB';
    }
    return $server_type;
}

?>