- var_dump: documentation ( source)
- preg_match: documentation ( source)
- key: documentation ( source)
<?php
$string = '<iframe width="640" height="360" src="http://www.youtube.com/embed/h9jOaIB1VGo?rel=0&wmode=transparent" frameborder="0" allowfullscreen></iframe>';
preg_match('/(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"\'>]+)/', $string, $matches);
var_dump(key($matches));