php键值相同的项数值相加

 1 php 合并一个二维数组相同项,数量则相加
 2
 3 $arr = array(
 4     array(
 5        ‘user_id‘ => 100,
 6        ‘goods_id‘ => 10,
 7        ‘number‘ => 1,
 8     ),
 9     array(
10        ‘user_id‘ => 100,
11        ‘goods_id‘ => 10,
12        ‘number‘ => 2,
13     ),
14     array(
15        ‘user_id‘ => 100,
16        ‘goods_id‘ => 10,
17        ‘number‘ => 2,
18     ),
19     array(
20        ‘user_id‘ => 100,
21        ‘goods_id‘ => 10,
22        ‘number‘ => 2,
23     ),
24 );
25 理想结果:
26 $arr = array(
27     array(
28         ‘user_id‘=> 100,
29         ‘goods_id‘ => 10,
30         ‘number‘ => 7,
31     ),
32
33 );
34
35
36 foreach($arr as $k=>$v){
37     if(!isset($item[$v[‘user_id‘]])){
38         $item[$v[‘user_id‘]]=$v;
39     }else{
40         $item[$v[‘user_id‘]][‘number‘]+=$v[‘number‘];
41     }
42 }
43 print_r($item);