php二维数组相同id的数量相加

数组样式

$arr = array(    array(       'user_id' => 100,       'goods_id' => 10,       'number' => 1,    ),    array(       'user_id' => 100,       'goods_id' => 10,       'number' => 2,    ),    array(       'user_id' => 100,       'goods_id' => 10,       'number' => 2,    ),    array(       'user_id' => 100,       'goods_id' => 10,       'number' => 2,    ),);

处理办法

$item=array();foreach($arr as $k=>$v){    if(!isset($item[$v['user_id']])){        $item[$v['user_id']]=$v;    }else{        $item[$v['user_id']]['number']+=$v['number'];    }}print_r($item);