[PHP] Protect site against bad/hack URL requests

<?php
/*   _____ _____ _ _____ _____         _____ _____ _____ _____
 ___|     | __  |_|  _  |_   _|___ ___|_   _|   __|  _  |     |
|_ -|   --|    -| |   __| | | |- _|___| | | |   __|     | | | |
|___|_____|__|__|_|__|    |_| |___|     |_| |_____|__|__|_|_|_|
|s C R i P T z - T E A M . i N F O|----------------------------

[PHP] Protect site against bad/hack URL requests
*/
define("REQUEST_LENGHT", "255");

if (strlen($_SERVER['REQUEST_URI']) > REQUEST_LENGHT || stripos($_SERVER['REQUEST_URI'], "eval(") ||
//stripos($_SERVER['REQUEST_URI'], "_just_some_hack_") ||
    stripos($_SERVER['REQUEST_URI'], "../")) {
    @header("HTTP/1.1 414 Request-URI Too Long");
    @header("Status: 414 Request-URI Too Long");
    @header("Connection: Close");
    @exit;
}
?>