PHP array_chunk() Function
Quick summary: The PHP array_chunk() function splits an array into chunks.
PHP array_chunk() Syntax
array_chunk(array $array, int $length, bool $preserve_keys = false): arrayPHP
PHP array_chunk() Basic examples
var_dump(array_chunk([1,2,3,4], 2));PHP
Output:
array(2) {
[0]=> array(2) { [0]=> int(1) [1]=> int(2) }
[1]=> array(2) { [0]=> int(3) [1]=> int(4) }
}Splits an array into chunks of equal size.
PHP array_chunk() Real-world usage
$items = range(1, 5);
$pages = array_chunk($items, 2);
var_dump($pages);PHP
Output:
array(3) {
[0]=> array(2) { [0]=> int(1) [1]=> int(2) }
[1]=> array(2) { [0]=> int(3) [1]=> int(4) }
[2]=> array(1) { [0]=> int(5) }
}Used for pagination or batching.
PHP array_chunk() Edge cases
var_dump(array_chunk(['a'=>1,'b'=>2], 1, true));PHP
Output:
array(2) {
[0]=> array(1) { ["a"]=> int(1) }
[1]=> array(1) { ["b"]=> int(2) }
}Preserves keys when the third argument is true.
PHP array_chunk() Common mistakes
Losing keys unintentionally
Keys are reset by default.
Incorrect
array_chunk(['a'=>1,'b'=>2], 1);Correct
array_chunk(['a'=>1,'b'=>2], 1, true);Enable key preservation when needed.
PHP array_chunk() Frequently Asked Questions
What does array_chunk() do?
Splits an array into chunks.
Syntax?
array_chunk(array, size, preserve_keys).
Preserve keys?
Optional.
Does it modify array?
No.
Use case?
Pagination or batching.
Handles associative arrays?
Yes.
Performance?
Good.
Chunk size limit?
Any integer.
Empty array?
Returns empty array.
Supports nested arrays?
Yes.
Maintains order?
Yes.
Alternative?
Manual slicing.