3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "sinoitator"; $b = "easy"; $c = "syuguoyrofrehpic"; $d = strrev($a); $e = strrev($c); $flag = $d+$b+$e; echo "art"; echo $flag; ?>

preferences:
35.4 ms | 402 KiB | 5 Q