PHP function array_merge_recursive() that merges one or more arrays into one array

Example

Merge two arrays into one array:

<?php
$a1=array("a"=>"red","b"=>"green");
$a2=array("c"=>"blue","b"=>"yellow");
print_r(array_merge_recursive($a1,$a2));
?>

Definition and usage

array_merge_recursive() function is used to merge one or more arrays into one array.

The difference between this function and the array_merge() function is that it handles the situation where two or more array elements have the same key name. array_merge_recursive() will not perform key name overwriting, but will recursively form multiple values ​​with the same key name into an array.

Note: If you only input an array to the array_merge_recursive() function, the result is the same as array_merge(), the function will return a new array with integer keys whose keys begin with 0 Begin reindexing.

Syntax

array_merge_recursive(array1,array2,array3...)

Technical details

[Example]

<?php 
$arr1 = array("color"=>array("favorite"=>"red"),5); 
$arr2 = array(10,"color"=>array("favorite"=>"green","blue")); 
var_dump(array_merge_recursive($arr1,$arr2));
?>

Output:

array(3) {
  ["color"]=>
  array(2) {
    ["favorite"]=>
    array(2) {
      [0]=>
      string(3) "red"
      [1]=>
      string(5) "green"
    }
    [0]=>
    string(4) "blue"
  }
  [0]=>
  int(5)
  [1]=>
  int(10)

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