3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $nu_array = null; $callback = function ( $item ) use(&$nu_array) { $nu_array[] = $item; }; $array = array('apple', array(1,2), 'butter',array(3,4,array(5,array(6,7)))); array_walk_recursive($array, $callback); print_r($nu_array); /** Array ( ) **/
based on F2juJ
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => apple [1] => 1 [2] => 2 [3] => butter [4] => 3 [5] => 4 [6] => 5 [7] => 6 [8] => 7 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Sp1S6 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/Sp1S6 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Sp1S6 on line 3
Process exited with code 255.