php二维数组雷同键名相加

Array
(
    [uid] => 19
    [pid] => Array
        (
            [0] => 91
            [1] => 81
        )

    [price] => Array
        (
            [0] => 6
            [1] => 14
        )

    [pnum] => Array
        (
            [0] => 1
            [1] => 1
        )

)

$ar = Array(
    'uid' => 19,
    'pid' => Array (
            0 => 91,
            1 => 81,
        ),
    'price' => Array (
            0 => 6,
            1 => 14,
        ),
    'pnum' => Array (
            0 => 1,
            1 => 1,
        ),
);

$r = array_map(function($t) {
    return is_array($t) ? array_sum($t) : $t;
   }, $ar);
print_r($r);

Array
(
    [uid] => 19
    [pid] => 172
    [price] => 20
    [pnum] => 2
)

$ar = Array(
    'uid' => 19,
    'pid' => Array (
            0 => 91,
            1 => 81,
        ),
    'price' => Array (
            0 => 6,
            1 => 14,
        ),
    'pnum' => Array (
            0 => 1,
            1 => 1,
        ),
);
foreach($ar as $k=>$v){
    $arr[$k] = is_array($v) ? array_sum($v) : $v;
}
print_r($arr);