3v4l.org

run code in 300+ PHP versions simultaneously
<?php function square(&$n) { if(is_numeric($n)) $n = ($n * $n); } $array = array(0, 48, 22, 90, 44, 9, 222, 'Iamzheasshole', 101); array_walk($array, 'square'); print_r($array);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 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 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 0 [1] => 2304 [2] => 484 [3] => 8100 [4] => 1936 [5] => 81 [6] => 49284 [7] => Iamzheasshole [8] => 10201 )

preferences:
247.88 ms | 406 KiB | 341 Q