将数组列表与数组中的下一个列表进行比较

Question

I would like to compare lists with others in order to merge if their numbers (id_article) are the same. In my example, I would like to obtain this final array list :

*Final *

Array
(
    [0] => Array
        (
            [id_article] => 1
            [quantite] => 5
        )

    [1] => Array
        (
            [id_article] => 3
            [quantite] => 1
        )

}

INITIAL

Array
(
    [0] => Array
        (
            [id_article] => 1
            [quantite] => 2
        )

    [1] => Array
        (
            [id_article] => 1
            [quantite] => 3
        )

    [2] => Array
        (
            [id_article] => 3
            [quantite] => 1
        )

)

I tried with next() and current() but didn't work in this case.

Thanks in advance for help, advice or others examples.

Answer 1

$a = array(
    array(
        'id_article' => 1,
        'quantite' => 2,
    ),
    array(
        'id_article' => 1,
        'quantite' => 3,
    ),
    array(
        'id_article' => 3,
        'quantite' => 1,
    ),
);

$b = array();

foreach ($a as $k => $v) {
    if (array_key_exists($v['id_article'], $b)) {
        $b[$v['id_article']]['quantite'] += $v['quantite'];
    } else {
        $b[$v['id_article']] = $v;
    }
}

return array_values($b);