PHP array_chunk Function: Splitting an Array into Chunks

The array_chunk function splits a given array into multiple sub‑arrays, each containing a number of elements defined by the $size argument; the final chunk may contain fewer elements.

Parameters $input – the array to be processed. $size – the number of elements each chunk should contain. $preserve_keys – optional boolean (default false). When set to true, the original keys are retained; otherwise, each chunk receives new numeric indexes starting from zero.

Return value

A multidimensional array where each element is a chunk of the original array, indexed from zero.

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));
?>

Output

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )
    [1] => Array
        (
            [0] => c
            [1] => d
        )
    [2] => Array
        (
            [0] => e
        )
)

Array
(
    [0] => Array
        (
            [a] => a
            [b] => b
        )
    [1] => Array
        (
            [c] => c
            [d] => d
        )
    [2] => Array
        (
            [e] => e
        )
)