How to merge arrays in php without changing key values

The way PHP can merge arrays without changing the key values ​​is to use the [ ] operator to merge arrays, such as [$array=$array1 $array2]. If you do not need to preserve key values, you can use the array_merge function to merge arrays.

The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.

In php we usually use the array_merge() function to merge one or more arrays, as shown below:

For example:

$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc'];
$data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff'];
$data = array_merge($data1, $data2);
var_dump($data);

Get the result:

array(6) {
  [0]=>  string(3) "aaa"
  [1]=>  string(3) "bbb"
  [2]=>  string(3) "ccc"
  [3]=>  string(3) "ddd"
  [4]=>  string(3) "eee"
  [5]=>  string(3) "fff"}

We can see from the above results that merging arrays using the array_merge() function will reset the key value.

So what if we don’t want to reset the key value and want to keep the original key value? We can use " " to merge two arrays, as shown below:

$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc'];
$data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff'];
$data = $data1 + $data2;
var_dump($data);

Get the result:

array(6) {
  [111]=>  string(3) "aaa"
  [222]=>  string(3) "bbb"
  [333]=>  string(3) "ccc"
  [444]=>  string(3) "ddd"
  [555]=>  string(3) "eee"
  [666]=>  string(3) "fff"}

Related recommendations: Introduction to Programming

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