3v4l.org

run code in 300+ PHP versions simultaneously
<?php array_walk([1,2,3], function($arr, $key) { echo $arr[$key]; })
Output for 5.4.0 - 5.4.30
Fatal error: Only variables can be passed by reference in /in/O7vc1 on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[', expecting ')' in /in/O7vc1 on line 4
Process exited with code 255.
preferences:
205.34 ms | 1395 KiB | 67 Q