<?php/* $Id: common.lib.php 9531 2006-10-10 14:06:56Z nijel $ */// vim: expandtab sw=4 ts=4 sts=4:/** * Functions for cleanup of user input. *//** * Removes all variables from request except whitelisted ones. * * @param string list of variables to allow * @return nothing * @access public * @author  Michal Cihar (michal@cihar.com) */function PMA_remove_request_vars(&$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]);        } else {            // allowed stuff could be compromised so escape it            // we require it to be a string            if (isset($_REQUEST[$key]) && is_string($_REQUEST[$key])) {                $_REQUEST[$key] = htmlspecialchars($_REQUEST[$key], ENT_QUOTES);            } else {                unset($_REQUEST[$key]);            }            if (isset($_POST[$key]) && is_string($_POST[$key])) {                $_POST[$key] = htmlspecialchars($_POST[$key], ENT_QUOTES);            } else {                unset($_POST[$key]);            }            if (isset($_COOKIE[$key]) && is_string($_COOKIE[$key])) {                $_COOKIE[$key] = htmlspecialchars($_COOKIE[$key], ENT_QUOTES);            } else {                unset($_COOKIE[$key]);            }            if (isset($_GET[$key]) && is_string($_GET[$key])) {                $_GET[$key] = htmlspecialchars($_GET[$key], ENT_QUOTES);            } else {                unset($_GET[$key]);            }        }    }}?>