Source/carbon/core/Common.php

   1 <?php
   2 /*------------------------------------------------------------
   3 *  CarbonPHP framework (C) Tom Bell
   4 *  http://tombell.org.uk
   5 *------------------------------------------------------------*/
   6
   7 if (!defined('CARBON_PATH'))
   8 {
   9         exit('Direct script access is not allowed.');
  10 }
  11
  12 function &load_class($class_name, $instantiate = true)
  13 {
  14         static $class_objects = array();
  15
  16         if (isset($class_objects[$class_name]))
  17         {
  18                 return $class_objects[$class_name];
  19         }
  20
  21         if (file_exists(APP_PATH . 'libraries/' . get_config_value('subclass_prefix') . $class_name . FILE_EXT))
  22         {
  23                 require(CARBON_PATH . 'libraries/' . $class_name . FILE_EXT);
  24                 require(APP_PATH . 'libraries/' . get_config_value('subclass_prexfix') . $class_name . FILE_EXT);
  25
  26                 $is_subclass = true;
  27         }
  28         else
  29         {
  30                 if (file_exists(APP_PATH . 'libraries/' . $class_name . FILE_EXT))
  31                 {
  32                         require(APP_PATH . 'libraries/' . $class_name . FILE_EXT);
  33
  34                         $is_subclass = false;
  35                 }
  36                 else
  37                 {
  38                         require(CARBON_PATH . 'libraries/' . $class_name . FILE_EXT);
  39                         $is_subclass = false;
  40                 }
  41         }
  42
  43         if (!$instantiate)
  44         {
  45                 $class_objects[$class_name] = true;
  46
  47                 return $class_objects[$class_name];
  48         }
  49
  50         if ($is_subclass)
  51         {
  52                 $full_class_name = get_config_value('subclass_prefix') . $class_name;
  53                 $class_objects[$class_name] = new $full_class_name();
  54
  55                 return $class_objects[$class_name];
  56         }
  57
  58         $full_class_name = ($class_name != 'Controller') ? 'Carbon_' . $class_name : $class_name;
  59         $class_objects[$class_name] = new $full_class_name();
  60
  61         return $class_objects[$class_name];
  62 }
  63
  64 function &load_config()
  65 {
  66         static $carbon_config;
  67
  68         if (isset($carbon_config))
  69         {
  70                 return $carbon_config[0];
  71         }
  72
  73         if (!file_exists(APP_PATH . 'config/config' . FILE_EXT))
  74         {
  75                 exit('The main CarbonPHP configuration file config' . FILE_EXT . ' does not exist.');
  76         }
  77
  78         require(APP_PATH . 'config/config' . FILE_EXT);
  79
  80         if (!isset($config) || !is_array($config))
  81         {
  82                 exit('The main CarbonPHP configuration file config' . FILE_EXT . ' is improperly formatted.');
  83         }
  84
  85         $carbon_config[0] =  $config;
  86
  87         return $carbon_config[0];
  88 }
  89
  90 function get_config_value($config_item)
  91 {
  92         static $config_items = array();
  93
  94         if (isset($config_items[$config_item]))
  95         {
  96                 return $config_items[$config_item];
  97         }
  98
  99         $config = load_config();
 100
 101         if (!isset($config[$config_item]))
 102         {
 103                 return false;
 104         }
 105
 106         $config_items[$config_item] = $config[$config_item];
 107
 108         return $config_items[$config_item];
 109 }
 110
 111 function display_error($error_message)
 112 {
 113         $exception = load_class('Exception');
 114         echo $exception->display_error('An error has been encountered', $error_message);
 115         exit();
 116 }
 117
 118 function display_not_found($page = '')
 119 {
 120         $exception = load_class('Exception');
 121         $exception->display_not_found($page);
 122         exit();
 123 }
 124
 125 function log_message($level = 'error', $message, $php_error = false)
 126 {
 127         static $logging;
 128         $config = load_config();
 129
 130         if (get_config_value('logging_threshold') == 0)
 131         {
 132                 return false;
 133         }
 134
 135         $logging = load_class('Logging');
 136         $logging->write_log_message($level, $message, $php_error);
 137 }
 138
 139 function exception_handler($severity, $message, $file_path, $line_number)
 140 {
 141         if ($severity == E_STRICT)
 142         {
 143                 return true;
 144         }
 145
 146         $exception = load_class('Exception');
 147
 148         if (($severity & error_reporting()) == $severity)
 149         {
 150                 $exception->display_php_error($severity, $message, $file_path, $line_number);
 151         }
 152
 153         $config = load_config();
 154
 155         if (get_config_value('logging_threshold') == 0)
 156         {
 157                 return true;
 158         }
 159
 160         $exception->log_exception($severity, $message, $file_path, $line_number);
 161 }
 162
 163 ?>