How to split string into array in PHP

How to split a string into an array in PHP

In PHP, we often need to process strings and split them into multiple parts. Splitting a string into an array is a common operation that helps us better handle the various parts of the string. In this article, we will learn how to split a string into an array using functions in PHP and provide some code examples.

1. Use the explode function to split the string into an array

PHP provides a function named explode, which can split the string according to the specified delimiter, and Return an array. The following is the syntax of the explode function:

array explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] )

Among them, $delimiter represents separation symbol, $string represents the string that needs to be split, and $limit represents the number of splits (optional parameter, the default is PHP_INT_MAX, which is unlimited).

Here is an example of how to use explode to split a string into an array:

$str = "apple,banana,orange";
$array = explode(",", $str);

print_r($array);

The output result is:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

In the above example, we use comma as Delimiter splits a string into an array. As you can see, the output result is an array containing three elements, each element is the part separated by the delimiter in the string.

2. Use the str_split function to split a string into an array

In addition to using the explode function, we can also use the str_split function to split a string into an array. The str_split function splits each character in a string into one element and returns an array containing the split characters. The following is the syntax of the str_split function:

array str_split ( string $string [, int $split_length = 1 ] )

Among them, $string represents the string that needs to be split , $split_length represents the length of each element (optional parameter, default is 1).

Here is an example of how to use str_split to split a string into an array:

$str = "Hello World";
$array = str_split($str);

print_r($array);

The output result is:

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

In the above example, we split the string "Hello World" is split into an array containing 11 elements, each element is a character in the string.

3. Customized method of splitting strings

In addition to using built-in functions, we can also customize methods to split strings into arrays. For example, we can use loops and string interception to implement custom string splitting.

The following is an example of how to use loops and string interception to implement custom string splitting:

function myExplode($delimiter, $string) {
    $arr = array();
    $length = strlen($delimiter);
    $start = 0;
    while (($end = strpos($string, $delimiter, $start)) !== false) {
        $arr[] = substr($string, $start, $end - $start);
        $start = $end + $length;
    }
    $arr[] = substr($string, $start);
    return $arr;
}

$str = "apple,banana,orange";
$array = myExplode(",", $str);

print_r($array);

The output is the same as the previous example:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

In In the above example, we defined a function named myExplode to implement custom string splitting using loops and string interception. This function adds the split string to an array and returns the array.

Summary:

This article introduces three methods of splitting strings into arrays in PHP. We can use the built-in functions explode and str_split to split the string, or we can use a custom method to achieve it. Depending on the specific needs, we can choose the appropriate method to process strings to help us better handle each part of the string. Hope this article is helpful to you!

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