PHP: array_merge_ recursive() function

Last update on August 19 2022 21:51:16 (UTC/GMT +8 hours)

PHP: Merge two or more arrays recursively

The array_merge_recursive() function is used to merge the elements of one or more arrays together. The elements of one are appended to the end of the previous one.

If the input arrays have matching string keys, then the values for these keys are merged together into an array, and this is done recursively, so that if one of the values is an array itself, the function will merge it with a corresponding entry in another array too.

If the input arrays contain numeric keys, the later value will be appended instead of overriding the original value.

Version:

(PHP 4 and above)

Syntax:

array_merge_recursive(array_name1, array_name2...)

Parameters:

Name	Description	Required / Optional	Type
array_name1	Specifies the name of the array.	Required	Array
array_name2..	Specifies the name of the array.	Optional	Array

Return value:

The merged array.

Value Type: Array

Example:

<?php
$array1=array("Subject" => "Physics","Chemistry", "Biology");
$array2=array("Class-XI", "Class-XII", "Roll"=>20);
$result=array_merge_recursive($array1, $array2);
print_r($result);
?>

Output:

Array ( [Subject] => Physics [0] => Chemistry [1] => Biology [2] => Class-XI [3] => Class-XII [Roll] => 20 )

View the example in the browser

Practice here online :

PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)