The array_merge_recursive Function
The array_merge_recursive function merges two
or more arrays together. The difference from the
array_merge
function becomes apparent when the arrays being merged
have identical keys. See the examples.
Syntax
array_merge_recursive(array ...$arrays): array
Example
Let's merge two arrays that have identical keys:
<?php
$arr1 = ['a' => 1, 2, 3];
$arr2 = ['a' => 4, 5, 6];
$res = array_merge_recursive($arr1, $arr2);
var_dump($res);
?>
Code execution result:
['a' => [1, 4], 2, 3, 5, 6]
Example
For comparison, see how the
array_merge function works:
<?php
$arr1 = ['a' => 1, 2, 3];
$arr2 = ['a' => 4, 5, 6];
$res = array_merge($arr1, $arr2);
var_dump($res);
?>
Code execution result:
['a' => 1, 2, 3, 5, 6]
See Also
-
the
array_mergefunction,
which also merges arrays -
the
array_combinefunction,
which merges two arrays into one associative array
