How to Split Array into Specific Number of Chunks in PHP ?

This article will show you how to split an array into a specific number of chunks using PHP. There are basically two approaches to solve this problem, these are:

• Using array_chunk() function
• Using array_slice() function

Approach 1: Using array_chunk() function

The array_chunk() function is used to split an array into parts or chunks of a given size depending upon the parameters passed to the function. The last chunk may contain fewer elements than the desired size of the chunk.

Syntax:

array array_chunk( $array, $size, $preserve_keys )

Example:

PHP

<?php

// PHP Program to Split Array into
// Specific Number of Chunks

// Declare an array
$arr = [
    "G", "e", "e", "k", "s",
    "f", "o", "r", "G", "e",
    "e", "k", "s"
];

// Use array_chunk() function to
// split array into chunks
print_r(array_chunk($arr, 4));

?>

Output:

Array ( 
    [0] => Array ( 
        [0] => G 
        [1] => e 
        [2] => e 
        [3] => k 
    ) 
    [1] => Array ( 
        [0] => s 
        [1] => f 
        [2] => o 
        [3] => r 
    ) 
    [2] => Array ( 
        [0] => G 
        [1] => e 
        [2] => e 
        [3] => k 
    ) 
    [3] => Array ( 
        [0] => s 
    ) 
)

Approach 2: Using array_slice() function

The array_slice() function is used to fetch a part of an array by slicing through it, according to the users choice.

Syntax:

array_slice($array, $start_point, $slicing_range, preserve)

Example:

PHP

<?php

// PHP Program to split array into
// Specific Number of Chunks

// Declare an array
$arr = [
    "G", "e", "e", "k", "s",
    "f", "o", "r", "G", "e",
    "e", "k", "s"
];

// Use array_slice() function to
// split array into chunks
$splitArr = [
    array_slice($arr, 0, 4),
    array_slice($arr, 4, 7),
    array_slice($arr, 8, 12),
    array_slice($arr, 12, 1),
];

print_r($splitArr);

?>

Output:

Array ( 
    [0] => Array ( 
        [0] => G 
        [1] => e 
        [2] => e 
        [3] => k 
    ) 
    [1] => Array ( 
        [0] => s 
        [1] => f 
        [2] => o 
        [3] => r 
    ) 
    [2] => Array ( 
        [0] => G 
        [1] => e 
        [2] => e 
        [3] => k 
    ) 
    [3] => Array ( 
        [0] => s 
    ) 
)