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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Functions for cleanup of user input.
*
* @package PhpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* Removes all variables from request except whitelisted ones.
*
* @param string &$whitelist list of variables to allow
*
* @return void
* @access public
*/
function PMA_removeRequestVars(&$whitelist)
{
// do not check only $_REQUEST because it could have been overwritten
// and use type casting because the variables could have become
// strings
$keys = array_keys(
array_merge((array)$_REQUEST, (array)$_GET, (array)$_POST, (array)$_COOKIE)
);
foreach ($keys as $key) {
if (! in_array($key, $whitelist)) {
unset($_REQUEST[$key], $_GET[$key], $_POST[$key], $GLOBALS[$key]);
continue;
}
// allowed stuff could be compromised so escape it
// we require it to be a string
if (isset($_REQUEST[$key]) && ! is_string($_REQUEST[$key])) {
unset($_REQUEST[$key]);
}
if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
unset($_POST[$key]);
}
if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
unset($_COOKIE[$key]);
}
if (isset($_GET[$key]) && ! is_string($_GET[$key])) {
unset($_GET[$key]);
}
}
}