<?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]]]);
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