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

1.处理前的数组：

<?php
$arr1 = 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'
)
);

2.根据2个数组id相同的一维数组，将$arr2的shop_name添加到$arr1，将$arr1的user_name添加到$arr2,如果没有相同的id，shop_name和user_name为空，处理后的数组：

$new_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'
),
);

3：处理的过程

$new_arr = array();
foreach ($arr1 as $val) {
$new_arr[$val['id']] = array('id'=>$val['id'],'shop_name'=>'','user_name'=>$val['user_name']);
}
foreach ($arr2 as $val) {
if(isset($new_arr[$val['id']])){
$new_arr[$val['id']]['shop_name'] = $val['shop_name'];
}else{
$new_arr[$val['id']] = array('id'=>$val['id'],'shop_name'=>$val['shop_name'],'user_name'=>'',);
}
}
var_dump(array_values($new_arr));