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<?php function array_multisum(array $arr): float { $sum = array_sum($arr); foreach($arr as $child) { $sum += is_array($child) ? array_multisum($child) : 0; } return $sum; } //как получить сумму чисел в массиве $arr = [[1,2,3],[1,2,3],[1,2,3]]; // = 18 ? echo array_multisum($arr);
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