- pathinfo: documentation ( source)
- var_dump: documentation ( source)
- parse_url: documentation ( source)
<?php
$url = parse_url('http://pdl.vimeocdn.com/18325/235/286738602.mp4?token2=1410918962_54fefc92ea1867b1fbfa1a2f2b4a8c20&aksessionid=7fce8f586eab08ab');
var_dump(pathinfo($url['path'], PATHINFO_EXTENSION));