数组何并

[下雨的声音丶]

Array
(
    [0] => Array
        (
            [goods_id] => 590
            [goods_num] => 1
            [goods_pay_price] => 2000.00
        )

    [1] => Array
        (
            [goods_id] => 626
            [goods_num] => 2
            [goods_pay_price] => 2000.00
        )

    [2] => Array
        (
            [goods_id] => 628
            [goods_num] => 1
            [goods_pay_price] => 1000.00
        )

    [3] => Array
        (
            [goods_id] => 628
            [goods_num] => 2
            [goods_pay_price] => 2000.00
        )

    [4] => Array
        (
            [goods_id] => 626
            [goods_num] => 2
            [goods_pay_price] => 2000.00
        )

)

怎么快速把这个数组合并起来 ，相同goods_id 的goods_num和goods_pay_price分别加起来

[xuzuning]

$a = array (
  0 => 
  array (
    'goods_id' => '590',
    'goods_num' => '1',
    'goods_pay_price' => '2000.00',
  ),
  1 => 
  array (
    'goods_id' => '626',
    'goods_num' => '2',
    'goods_pay_price' => '2000.00',
  ),
  2 => 
  array (
    'goods_id' => '628',
    'goods_num' => '1',
    'goods_pay_price' => '1000.00',
  ),
  3 => 
  array (
    'goods_id' => '628',
    'goods_num' => '2',
    'goods_pay_price' => '2000.00',
  ),
  4 => 
  array (
    'goods_id' => '626',
    'goods_num' => '2',
    'goods_pay_price' => '2000.00',
  ),
);
$r = [];
array_map(function($v) use (&$r) {
  $r[$v['goods_id']]['goods_id'] = $v['goods_id'];
  @$r[$v['goods_id']]['goods_num'] += $v['goods_num'];
  @$r[$v['goods_id']]['goods_pay_price'] += $v['goods_pay_price'];
  }, $a);
print_r($r);

Array
(
    [590] => Array
        (
            [goods_id] => 590
            [goods_num] => 1
            [goods_pay_price] => 2000
        )

    [626] => Array
        (
            [goods_id] => 626
            [goods_num] => 4
            [goods_pay_price] => 4000
        )

    [628] => Array
        (
            [goods_id] => 628
            [goods_num] => 3
            [goods_pay_price] => 3000
        )

)