How to merge arrays in php but keep the key names unchanged

In PHP, you can use the plus sign " " to merge arrays, the specific syntax format is "array 1 array 2", so that the key names of the combined arrays will not be reset. Use the plus sign " " to merge two arrays, whether they are ordinary arrays or key-value arrays. As long as the subscripts are the same or the keys are the same, the former overwrites the latter.

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

Generally, array_merge is used to merge two arrays in PHP ()

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"
}

You can see that using array_merge() will reset the key value. If the key value is useful to us, we don’t want to reset it. , you can use " " to merge arrays.

$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"
}

Explanation:

For using " " to merge two arrays, whether it is an ordinary array or a key-value pair array, just download If the labels are the same or the keys are the same, the former overrides the latter. This needs attention.

$arr1 = array(1, 2, 3, 4, 5);
$arr2 = array(1, 2, 6, 7, 8, 9, 10);
$result1 = $arr1 + $arr2;


$arr3 = array("name" => "itbsl", "age" => 13, "sex" => "Male");
$arr4 = array("name" => "火龙果", "age" => 13, "sex" => "Male", "id" => "411521");
$result2 = $arr3 + $arr4;

echo "<pre class="brush:php;toolbar:false">";
var_dump($result1);
var_dump($result2);

Get the result:

Recommended study: "PHP Video Tutorial"

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