3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1, 2, 3, 4, 5 ); $step = 2; function myfunc($key, $value) { global $step; if ($key == $step) echo ' $ '; echo "$value "; } array_walk($a, 'myfunc');

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31.63 ms | 402 KiB | 5 Q