Как суммировать элементы массива на php?

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$array = [1, 2, 3, 4, 5];
$sum = 0;
foreach($array as $value){
    $sum += $value;
}
echo $sum;

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$array = [1, 2, 3, 4, 5];
echo array_sum($array);

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function array_sum_recursive($array) {
    $sum = 0;
    foreach ($array as $value) {
        if (is_array($value)) {
            $sum += array_sum_recursive($value);
        } else {
            $sum += $value;
        }
    }
    return $sum;
}

$arr = array(1, 2, array(3, array(4, 5)), 6);
echo array_sum_recursive($arr);