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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);