php 数组合并，去除重复的

$arr = array(
        array(
            'id' => 1,
            'user_name'=>'test1'
        ),
        array(
            'id' => 2,
            'user_name'=>'test2'
        ),
        array(
            'id' => 3,
            'user_name'=>'test3'
        )
    );
    $arr2 = array(
        array(
            'id' => 1,
            'shop_name'=>'shop1'
        ),
        array(
            'id' => 5,
            'shop_name'=>'shop2'
        ),
        array(
            'id' => 3,
            'shop_name'=>'shop3'
        )
    );
   // dump(array_merge_recursive($arr,$arr2));  //二个数组合成一个数组
    echo "<hr>";
    $shop_name = array_column($arr2, 'shop_name','id');
    foreach($arr as $key => $item) {
        $exist = array_key_exists($item['id'], $shop_name);  
        $arr[$key]['shop_name'] = $exist ? $shop_name[$item['id']] : ''; //重复的id 合并
    }
    dump($arr);