3v4l.org

run code in 300+ PHP versions simultaneously
<?php $img = array("http://i.stack.imgur.com/52Ha1.png","http://example.com/img.jpg"); foreach ( $img as $v ) { echo $v, getimagesize($v) ? " = OK \n" : " = Not valid \n"; }

preferences:
39.95 ms | 402 KiB | 5 Q