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@ 2014-06-30T16:26:50Z

<?php
    $a = [1,2,3,4];
    $m = [];
    $b = array_walk($a,function($c){
        static $m; 
        global $m;
        $m = $c . $m; 
    });

Output
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array_walk: documentation ( source)

preferences:dark modelive preview

38.04 ms | 402 KiB | 5 Q