本例模拟 register_globals On。如果改变了配置文件中的 variables_order 选项，则考虑对
$superglobals 作出相应的改动。
<?php
// Emulate register_globals on
if (!ini_get('register_globals')) {
$superglobals = array($_SERVER, $_ENV,
$_FILES, $_COOKIE, $_POST, $_GET);
if (isset($_SESSION)) {
array_unshift($superglobals, $_SESSION);
}
foreach ($superglobals as $superglobal) {
extract($superglobal, EXTR_SKIP);
}
}
?>
本例模拟 register_globals Off。要记住此代码应在脚本最开头的地方调用。如果使用了会话机制，则在
session_start() 之后调用。
<?php
// Emulate register_globals off
function unregister_GLOBALS()
{
if (!ini_get('register_globals')) {
return;
}
// Might want to change this perhaps to a nicer error
if (isset($_REQUEST['GLOBALS']) || isset($_FILES['GLOBALS'])) {
die('GLOBALS overwrite attempt detected');
}
// Variables that shouldn't be unset
$noUnset = array('GLOBALS', '_GET',
'_POST', '_COOKIE',
'_REQUEST', '_SERVER',
'_ENV', '_FILES');
$input = array_merge($_GET, $_POST,
$_COOKIE, $_SERVER,
$_ENV, $_FILES,
isset($_SESSION) && is_array($_SESSION) ? $_SESSION : array());
foreach ($input as $k => $v) {
if (!in_array($k, $noUnset) && isset($GLOBALS[$k])) {
unset($GLOBALS[$k]);
}
}
}
unregister_GLOBALS();
?>