- urldecode: documentation ( source)
<?php
$_GET[id] = '%61%64%6D%69%6E';
if(eregi("admin",$_GET[id])) {
echo("<p>not allowed!</p>");
exit();
}
$_GET[id] = urldecode($_GET[id]);
echo $_GET[id];
if($_GET[id] == "admin")
{
echo "<p>Access granted!</p>";
echo "<p>Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx </p>";
}