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[phpmyadmin-themes.git] / libraries / cleanup.lib.php
blobb77fd315e03965856816419568d6caf6d8c26e6b
1 <?php
2 /* vim: set expandtab sw=4 ts=4 sts=4: */
3 /**
4 * Functions for cleanup of user input.
6 * @package phpMyAdmin
7 */
9 /**
10 * Removes all variables from request except whitelisted ones.
12 * @param string list of variables to allow
13 * @return nothing
14 * @access public
16 function PMA_remove_request_vars(&$whitelist)
18 // do not check only $_REQUEST because it could have been overwritten
19 // and use type casting because the variables could have become
20 // strings
21 $keys = array_keys(array_merge((array)$_REQUEST, (array)$_GET, (array)$_POST, (array)$_COOKIE));
23 foreach($keys as $key) {
24 if (! in_array($key, $whitelist)) {
25 unset($_REQUEST[$key], $_GET[$key], $_POST[$key], $GLOBALS[$key]);
26 } else {
27 // allowed stuff could be compromised so escape it
28 // we require it to be a string
29 if (isset($_REQUEST[$key]) && ! is_string($_REQUEST[$key])) {
30 unset($_REQUEST[$key]);
32 if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
33 unset($_POST[$key]);
35 if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
36 unset($_COOKIE[$key]);
38 if (isset($_GET[$key]) && ! is_string($_GET[$key])) {
39 unset($_GET[$key]);