How to use str_split to split a string into a character array in PHP

M66 2025-05-28

In PHP, the str_split() function is a very practical tool that can split a string into an array of single characters. This function is especially useful when strings need to be processed by character characters. Next, we will introduce the basic usage of the str_split() function and parse its functions with some examples.

Introduction to str_split() function

The str_split() function splits strings into single characters and stores them in an array. The function prototype is as follows:

 array str_split(string $string, int $length = 1)

$string : This is the original string that needs to be split.
$length : This is the length of each split substring. The default is 1, which means that each character will be stored in the array as an element.

The return value of str_split() function

This function returns an array where each element is a character extracted from the original string. If the $length parameter is provided, it is split by the specified length.

Example 1: Split a string into a single character

 <?php
$string = "Hello, world!";
$array = str_split($string);
print_r($array);
?>

Output:

 Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] => ,
    [6] =>  
    [7] => w
    [8] => o
    [9] => r
    [10] => l
    [11] => d
    [12] => !
)

In this example, we split the string "Hello, world!" into an array of each character.

Example 2: Splitting string by specified length

 <?php
$string = "Hello, world!";
$array = str_split($string, 5);
print_r($array);
?>

Output:

 Array
(
    [0] => Hello
    [1] => , wor
    [2] => ld!
)

In this example, str_split() splits the string into three parts according to length 5, and the result is an array containing substrings.

Example 3: Processing strings containing URLs

Suppose we have a string containing the URL and we need to split the string into a character array. Assuming that the domain name of the URL is m66.net , we can use str_split() to split the string and process it:

str_split