array_merge

(PHP 4, PHP 5, PHP 7, PHP 8)

array_mergeMerge one or more arrays

Description

array_merge(array ...$arrays): array

Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.

If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.

Values in the input arrays with numeric keys will be renumbered with incrementing keys starting from zero in the result array.

Parameters

arrays

Variable list of arrays to merge.

Return Values

Returns the resulting array. If called without any arguments, returns an empty array.

Changelog

Version Description
7.4.0 This function can now be called without any parameter. Formerly, at least one parameter has been required.

Examples

Example #1 array_merge() example

<?php
$array1 
= array("color" => "red"24);
$array2 = array("a""b""color" => "green""shape" => "trapezoid"4);
$result array_merge($array1$array2);
print_r($result);
?>

The above example will output:

Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)

Example #2 Simple array_merge() example

<?php
$array1 
= array();
$array2 = array(=> "data");
$result array_merge($array1$array2);
?>

Don't forget that numeric keys will be renumbered!

Array
(
    [0] => data
)

If you want to append array elements from the second array to the first array while not overwriting the elements from the first array and not re-indexing, use the + array union operator:

<?php
$array1 
= array(=> 'zero_a'=> 'two_a'=> 'three_a');
$array2 = array(=> 'one_b'=> 'three_b'=> 'four_b');
$result $array1 $array2;
var_dump($result);
?>

The keys from the first array will be preserved. If an array key exists in both arrays, then the element from the first array will be used and the matching key's element from the second array will be ignored.

array(5) {
  [0]=>
  string(6) "zero_a"
  [2]=>
  string(5) "two_a"
  [3]=>
  string(7) "three_a"
  [1]=>
  string(5) "one_b"
  [4]=>
  string(6) "four_b"
}

Example #3 array_merge() with non-array types

<?php
$beginning 
'foo';
$end = array(=> 'bar');
$result array_merge((array)$beginning, (array)$end);
print_r($result);
?>

The above example will output:

    Array
    (
        [0] => foo
        [1] => bar
    )

See Also

Here you can write a comment


Please enter at least 10 characters.
Loading... Please wait.
* Pflichtangabe
There are no comments available yet.

PHP cURL Tutorial: Using cURL to Make HTTP Requests

cURL is a powerful PHP extension that allows you to communicate with different servers using various protocols, including HTTP, HTTPS, FTP, and more. ...

TheMax

Autor : TheMax
Category: PHP-Tutorials

Midjourney Tutorial - Instructions for beginners

There is an informative video about Midjourney, the tool for creating digital images using artificial intelligence, entitled "Midjourney tutorial in German - instructions for beginners" ...

Mike94

Autor : Mike94
Category: KI Tutorials

Basics of views in MySQL

Views in a MySQL database offer the option of creating a virtual table based on the result of an SQL query. This virtual table can be queried like a normal table without changing the underlying data. ...

admin

Autor : admin
Category: mySQL-Tutorials

Publish a tutorial

Share your knowledge with other developers worldwide

Share your knowledge with other developers worldwide

You are a professional in your field and want to share your knowledge, then sign up now and share it with our PHP community

learn more

Publish a tutorial