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@ 2017-02-02T10:37:37Z

<?php

function arraySum(array $array) {
    $stack = [$array];
    $sum   = 0;

    while (($items = array_pop($stack))) {
        foreach ($items as $item) {
            if (is_array($item)) {
                $stack[] = $item;
            }
            else {
                $sum += $item;
            }
        }
    }
    
    return $sum;
}

echo arraySum([1, [1, 1], [1, [1, 1]]]);

Output
Performance
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References
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array_pop: documentation ( source)

preferences:dark modelive preview

63.19 ms | 402 KiB | 5 Q