PHP: array_chunk() function

Last update on August 19 2022 21:50:39 (UTC/GMT +8 hours)

PHP: Split an array into chunks

The array_chunk() function is used to split an array into arrays with size elements. The last chunk may contain less than size elements.

Version:

(PHP 4 and above)

Syntax:

array_chunk(input_array, size, preserve_keys)

Parameters:

Name	Description	Required / Optional	Type
input_array	Specifies the array to split.	Required	Array
size	The size of each chunk (i.e. the number of elements)	Required	Integer
preserve_keys	If we set preserve_keys as TRUE, array_chunk function preserves the original array keys. The default is FALSE which will reindex the chunk numerically.	Optional	Boolean

Return value:

A multidimensional numerically indexed array.

Value Type: Array

Example - 1:

<?php
$input_array = array('name1', 'name2', 'name3', 'name4', 'name5');
print_r(array_chunk($input_array,2));
?>

Output:

Array  ( [0] => Array ( [0] => name1 [1] => name2 ) [1] => Array ( [0] => name3 [1] => name4)   [2] => Array ([0] => name5 ))

Pictorial Presentation:

php function reference: array_chunk() function

View the example in the browser

Example - 2:

In the following example, we set preserve_keys as TRUE, therefore, array_chunk function preserves the original array keys.

<?php
$input_array = array('name1', 'name2', 'name3', 'name4', 'name5');
print_r(array_chunk($input_array,2,true));
?>

Output:

Array ( [0] => Array ( [0] => name1 [1] => name2 ) [1] => Array ( [2] => name3 [3] => name4 ) [2] => Array ( [4] => name5 ) )

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
)