php将两个不同长度数组相同的key合并到一个数组，不同的key也合并进去

Question

$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'
    ),
    array(
    'id' => 4,
    'shop_name'=>'shop4'
    )
);

怎么根据2个数组id相同的一维数组，将$arr2的shop_name添加到$arr，将$arr的user_name添加到$arr2,如果没有相同的id，shop_name和user_name为空，形成如下数组：

$good_arr =array(
    array(
    'id' => 1,
    'user_name'=>'test1',
    'shop_name'=>'shop1'
    ),
    array(
    'id' => 2,
    'user_name'=>'test2',
    'shop_name'=>''
    ),
    array(
    'id' => 3,
    'user_name'=>'test3',
    'shop_name'=>'shop3'
    ),
    array(
    'id' => 4,
    'user_name'=>'',
    'shop_name'=>'shop4'
    ),
    array(
    'id' => 5,
    'user_name'=>'',
    'shop_name'=>'shop2'
    ),

);

Answer 1

可以用这个函数 array_merge_recursive

Answer 2

以 id 为 key 分别循环一次

$goods_arr = array();
foreach ($arr as $data) {
    $goods_arr[$data['id']] = array('id'=>$data['id'],'shop_name'=>'','user_name'=>$data['user_name']);
}
foreach ($arr2 as $data) {
    if(isset($goods_arr[$data['id']])){
        $goods_arr[$data['id']]['shop_name'] = $data['shop_name'];
    }else{
        $goods_arr[$data['id']] = array('id'=>$data['id'],'shop_name'=>$data['shop_name'],'user_name'=>'',);
    }
}

var_dump(array_values($goods_arr));

Answer 3

$arr3 = array();
foreach ($arr as $v) {

$v['shop_name']='';
$arr3[$v['id']] = $v;

}
foreach ($arr2 as $v2) {

if(isset($arr3[$v2['id']])){
    $arr3[$v2['id']]['shop_name'] = $v2['shop_name'];
}else{
    $v2['user_name']='';
    $arr3[$v2['id']] =$v2;
}

}
dump($arr3);

Answer 4

写2个foreach循环