array_chunk

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

array_chunk — Split an array into chunks

Description

array_chunk(array $array, int $length, bool $preserve_keys = false): array

Chunks an array into arrays with length elements. The last chunk may contain less than length elements.

Parameters

array

The array to work on

length

The size of each chunk

preserve_keys

When set to true keys will be preserved. Default is false which will reindex the chunk numerically

Return Values

Returns a multidimensional numerically indexed array, starting with zero, with each dimension containing length elements.

Errors/Exceptions

If length is less than 1, a ValueError will be thrown.

Changelog

VersionDescription
8.0.0If length is less than 1, a ValueError will be thrown now; previously, an error of level E_WARNING has been raised instead, and the function returned null.

Examples

Example #1 array_chunk() example

<?php
$input_array = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2, true));
?>

The above example will output:

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [0] => c
            [1] => d
        )

    [2] => Array
        (
            [0] => e
        )

)
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [2] => c
            [3] => d
        )

    [2] => Array
        (
            [4] => e
        )

)

See Also