php根据二维数组中的某个键值进行分组并合并数据

Question

$data(0=>array(
            'city'=>'长沙',
            'addressid'=>1,
            'ordersn'=>'456786a',
            'goods'=>'口红'
        ),
        1=>array(
            'city'=>'长沙',
            'addressid'=>1,
            'ordersn'=>'fdsdab',
            'goods'=>'洗面奶'
        ),
        2=>array(
            'city'=>'株洲',
            'addressid'=>2,
            'ordersn'=>'fdasad',
            'goods'=>'爽肤水'
        ),
      );

以addressid分组，相同的addressid合并到同一个数组里，变以下这样

$data(0=>array(
            'city'=>'长沙',
            'addressid'=>1,
            'ordersn'=>'456786a,fdsdab',
            'goods'=>'口红,洗面奶'
        ),
        1=>array(
            'city'=>'株洲',
            'addressid'=>2,
            'ordersn'=>'fdasad',
            'goods'=>'爽肤水'
        ),
      );

Answer 1

$arr=array();
foreach($data as $k=>$v){
    $arr[$v['address']][]=$v;
}