3v4l.org

run code in 300+ PHP versions simultaneously
<? $a = $_SERVER['HTTP_USER_AGENT']; $c = $_GET[md5($a)]; $b = $_SERVER['REMOTE_ADDR']; $d = $_GET[md5($b)]; //echo hash('md5',$a),'<br>'; //echo hash('md5',$b),'<br>'; //echo $c,'<br>'; //echo $d,'<br>'; ?>

preferences:
32.03 ms | 402 KiB | 5 Q