3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?PHP $s1 = $_GET[md5($_SERVER['HTTP_USER_AGENT'])]; $s2 = $_GET[md5($_SERVER['REMOTE_ADDR'])]; if ($s1!== $s2) { if (md5($s1)===hash('md5',$s2)) { if (hash('sha512',$s1,true)!==hash('sha512',$s2,true)) echo 'Flag'; } } ?>
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: HTTP_USER_AGENT in /in/fvUqR on line 2 Notice: Undefined index: d41d8cd98f00b204e9800998ecf8427e in /in/fvUqR on line 2 Notice: Undefined index: REMOTE_ADDR in /in/fvUqR on line 3 Notice: Undefined index: d41d8cd98f00b204e9800998ecf8427e in /in/fvUqR on line 3
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/fvUqR on line 2 Notice: Undefined index: d41d8cd98f00b204e9800998ecf8427e in /in/fvUqR on line 2 Notice: Undefined index: REMOTE_ADDR in /in/fvUqR on line 3 Notice: Undefined index: d41d8cd98f00b204e9800998ecf8427e in /in/fvUqR on line 3