PHP in Windows, under IIS and Apache, file path is handled differently, for example:

<?php
echo $_SERVER["SCRIPT_FILENAME"];
?>

Under IIS:

C:\Projects\test.php

Under Apache:

C:/Projects/test.php

So if you want based on “/” to do something like RegEx, remember convert Windows style file path to Unix style, e.g:

<?php
$filename = str_replace(‘\’, ‘/‘, $_SERVER["SCRIPT_FILENAME"]);
?>

Then your PHP will run cross platform either in Windows IIS or Apache, or Linux.