3v4l.org

run code in 300+ PHP versions simultaneously
<?php $worked = false; if($a = function(){return null;}) $worked = true; assert(true == $worked); if($b = function(){return array('test'=>'test');}) $worked = false; assert(false == $worked);
Output for 5.5.0 - 5.5.38, 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
preferences:
210.3 ms | 404 KiB | 258 Q