合并具有相同索引值的2d数组

问题描述：

How can I merge one array inside another 2d array based on a unique value that is shared on both 2d array?

Arrays:

$arr1 = [
    "First" =>[
        "Name" => "John",
        "Id" => 123
    ],
    "Second" =>[
        "Name" => "Peter",
        "Id" => 45
    ]
];  

$arr2 = [
    "First" =>[
        "Age" => 34,
        "Id" => 123
    ],
    "Second" =>[
        "Age" => 24,
        "Id" => 45
    ]
];

$n = array_merge($arr1, $arr2);

Current output when var_dump $n:

array(2) {
 ["First"]=>
   array(2) {
    ["Age"]=>
    int(34)
    ["Id"]=>
    int(123)
 }
 ["Second"]=>
  array(2) {
    ["Age"]=>
    int(24)
    ["Id"]=>
    int(45)
 }
}

Desired output:

array(2) {
 ["First"]=>
   array(2) {
    ["Name"]=>
    String("John")
    ["Age"]=>
    int(34)
    ["Id"]=>
    int(123)
 }
 ["Second"]=>
  array(2) {
    ["Name"]=>
    String("Peter")
    ["Age"]=>
    int(24)
    ["Id"]=>
    int(45)
 }
}

Ofcourse just by merging the two arrays wont fix my issue, but i was just wondering what approach I should take to do this.

如何根据在2d数组上共享的唯一值将另一个2d数组中的一个数组合并？

数组： p>

  $ arr1 = [
“First”=＆gt; [
“Name”=＆gt;  “John”，
“Id”=＆gt;  123 
]，
“第二个”=＆gt; [
“名称”=＆gt;  “彼得”，
“Id”=＆gt;  45 
] 
];  
 
 $ arr2 = [
“First”=＆gt; [
“年龄”=＆gt;  34，
“Id”=＆gt;  123 
]，
“第二个”=＆gt; [
“年龄”=＆gt;  24，
“Id”=＆gt;  45 
] 
]; 
 
 $ n = array_merge（$ arr1，$ arr2）; 
  code>  pre> 
 
  var_dump $ n时的当前输出：  p> 
 
 
  array（2）{
 [“First”] =＆gt; 
 array（2）{
 [“Age”] =＆gt; 
 int（34）  
 [“Id”] =＆gt; 
 int（123）
} 
 [“Second”] =＆gt; 
 array（2）{
 [“Age”] =＆gt; 
 int（  24）
 [“Id”] =＆gt; 
 int（45）
} 
} 
  code>  pre> 
 
 所需的输出： p> 
  
 
  array（2）{
 [“First”] =＆gt; 
 array（2）{
 [“Name”] =＆gt; 
 String（“John”）
  [“Age”] =＆gt; 
 int（34）
 [“Id”] =＆gt; 
 int（123）
} 
 [“Second”] =＆gt; 
 array（2）{  
 [“名称”] =＆gt; 
字符串（“彼得”）
 [“年龄”] =＆gt; 
 int（24）
 [“Id”] =＆gt; 
 int（45）  
} 
} 
  code>  pre> 
 
 仅仅通过合并两个数组不会解决我的问题，但我只是想知道我应该采取什么方法来做到这一点。  / p> 
  div>

答

Assuming this structure of your arrays, you can use array_replace_recursive.

$n = array_replace_recursive($arr1, $arr2);

Fiddle: https://3v4l.org/IPGsl

Some people can say that you can use array_merge_recursive, but no. As you have same key (Id) in both arrays, resulting array will have not the structure you expect. But in case you have different keys in both arrays - array_merge_recursive is an option too.

合并具有相同索引值的2d数组

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