Группируйте многомерные данные по столбцу и суммируйте другой столбец в каждой группе. ⇐ Php

[Anonymous]

У меня есть этот массив, и мне нужно сгруппировать подмножества данных по столбцу code и суммировать столбцы Product_quantity внутри каждой группы.
$zone = array (
0 =>
array (
'Bertoua Zone 3' =>
array (
0 =>
array (
'code' => 'BFT50C',
'product_quantity' => '4',
'zone_name' => 'Bertoua Zone 3',
),
1 =>
array (
'code' => 'MNY65C',
'product_quantity' => '10',
'zone_name' => 'Bertoua Zone 3',
),
2 =>
array (
'code' => 'JAP65C',
'product_quantity' => '7',
'zone_name' => 'Bertoua Zone 3',
),
3 =>
array (
'code' => 'MNY65C',
'product_quantity' => '4',
'zone_name' => 'Bertoua Zone 3',
),
4 =>
array (
'code' => 'JAP65C',
'product_quantity' => '3',
'zone_name' => 'Bertoua Zone 3',
),
5 =>
array (
'code' => 'BFT50C',
'product_quantity' => '3',
'zone_name' => 'Bertoua Zone 3',
),
6 =>
array (
'code' => 'JAP65C',
'product_quantity' => '2',
'zone_name' => 'Bertoua Zone 3',
),
),
'Bertoua Zone 1' =>
array (
0 =>
array (
'code' => 'MNY65C',
'product_quantity' => '5',
'zone_name' => 'Bertoua Zone 1',
),
1 =>
array (
'code' => 'JAP65C',
'product_quantity' => '3',
'zone_name' => 'Bertoua Zone 1',
),
2 =>
array (
'code' => 'BFT50C',
'product_quantity' => '7',
'zone_name' => 'Bertoua Zone 1',
),
3 =>
array (
'code' => 'MNY65C',
'product_quantity' => '15',
'zone_name' => 'Bertoua Zone 1',
),
4 =>
array (
'code' => 'JAP65C',
'product_quantity' => '5',
'zone_name' => 'Bertoua Zone 1',
),
5 =>
array (
'code' => 'BFT50C',
'product_quantity' => '4',
'zone_name' => 'Bertoua Zone 1',
),
),
),
)

Я хочу получить такой результат:
$recapByZone = array (
0 =>
array (
'Bertoua Zone 3' =>
array (
0 =>
array (
'code' => 'BFT50C',
'product_quantity' => 7,
'zone_name' => 'Bertoua Zone 3',
),
1 =>
array (
'code' => 'MNY65C',
'product_quantity' => 14,
'zone_name' => 'Bertoua Zone 3',
),
2 =>
array (
'code' => 'JAP65C',
'product_quantity' => 12,
'zone_name' => 'Bertoua Zone 3',
),
),
'Bertoua Zone 1' =>
array (
0 =>
array (
'code' => 'MNY65C',
'product_quantity' => 20,
'zone_name' => 'Bertoua Zone 1',
),
1 =>
array (
'code' => 'JAP65C',
'product_quantity' => 8,
'zone_name' => 'Bertoua Zone 1',
),
2 =>
array (
'code' => 'BFT50C',
'product_quantity' => 11,
'zone_name' => 'Bertoua Zone 1',
),
),
),
)


Подробнее здесь: https://stackoverflow.com/questions/731 ... each-group