PHP: array_merge() function

Last update on August 19 2022 21:51:15 (UTC/GMT +8 hours)

PHP: Merge one or more arrays

The array_merge() function used to merge one or more arrays.
If the input arrays have matching string keys, then the later value will override it's the previous counterpart.
If the input arrays contain numeric keys, the later value will be appended instead of overriding the original value.
If there is only one array, the array is numerically indexed, the keys get reindexed in a continuous way.

Version:

(PHP 4 and above)

Syntax:

array_merge(array_name1, array_name2, array_name3...)

Parameters:

Name	Description	Required / Optional	Type
array_name1	The name of the array.	Required	Array
array_name2...	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", "Section"=>"A");
$result=array_merge($array1, $array2);
print_r($result);
?>

Output:

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

Pictorial Presentation:

php function reference: array_merge() function

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
)