How to sum the values of an associative array?

by

you should try this:

$array = [
    0 => [
        "addition_price" => [
            0,
            40,
            40
        ]
    ],
    1 => [
        "addition_price" => [
            100
        ]
    ],
];
foreach ($array as $key=>$value) {
    if(!empty($value['addition_price']) && is_array($value['addition_price'])){
        echo $key. " => " .array_sum($value['addition_price']). "<br>";
    }
}

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