- var_dump: documentation ( source)
- base64_decode: documentation ( source)
- str_replace: documentation ( source)
<?php
$url = 'http://tiles.xbox.com/tiles/Bk/0z/0ICLiGJhbC81FQUbXVdRF0E3L2FjaC8wL0EAAAAA5+fn-xxNHQ==.jpg';
$str = str_replace('http://tiles.xbox.com/tiles', '', $url);
$str = str_replace('/', '', $url);
$str = str_replace('-', '/', $url);
var_dump(base64_decode($str));