3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; define('Foo\\true', false, true); define('Foo\\false', true, true); $a = true; var_dump($a); if (!$a) { echo 'this should print'; } else { echo 'WTF man!!!'; }

preferences:
38.5 ms | 402 KiB | 5 Q