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@ 2017-10-23T09:38:09Z

<?php

$selectedCats = [2,4,6];
            array_walk($selectedCats, function (&$cat) {
                return $cat * 2;
            });
            
            var_dump($selectedCats);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_walk: documentation ( source)

preferences:dark modelive preview

54.57 ms | 402 KiB | 5 Q