whitelist doesn't work

[wesley]

Hello,

I have a whitelist of pages, but it doesn't work.
If you visit a page (write.php) that is not on the white list, the browser isn't going to index.php. But this is not the intention.
I have five pages: products.php, contact.php, information.php, login.php and write.php
My whitelist is:

<?php
session_start();
$whitelist = array("/folder/products.php", "/folder/contact.php", "/folder/information.php", "/folder/login.php");  
$ip = $_SERVER['SCRIPT_NAME'];
//var_dump($ip);
if (in_array($ip, $whitelist)) {
    //echo "You can access the whitelist page!";
} else {
	session_destroy ();
    header("Location: index.php");die();
}

?>

My question is: how can I make the whitelist when you visit a page, that is not on the whitelist, that the browser go to index.php?

can someone help me?

thanks in advance.

[justsomeguy]

Code that like will generally work, so if it's not working then you should verify what you're comparing to make sure that it actually is or is not in the list.

[dsonesuk]

How is this code instered and where is this code placed?