How to split string into array in php

PHP language is a scripting programming language widely used in the field of web development and is one of the most popular languages ​​​​in server-side programming. Among them, processing strings is a very basic and important operation in PHP, and converting strings into arrays is a common operation for processing strings. So, in PHP, what exactly is used to divide arrays into arrays? This article will introduce it to you in detail.

1. explode function

The explode function in PHP is the most common way to split a string into an array. The syntax format of this function is as follows:

explode(separator, string, limit);

Among them, separator represents the separator in the string; string represents the string to be split; limit represents the maximum number of array elements returned. If limit is set to a negative number, it means that all elements are returned. If limit exceeds the length of the string, an empty array is returned.

The following is an example of using the explode function to split a string into an array:

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

print_r($arr);

The running result is:

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

In the above example, use the explode function to split the characters into arrays: The string $str is split into an array $arr according to commas. Each element of the array is apple, banana and orange respectively.

2. preg_split function

In addition to the explode function, you can also use the preg_split function in PHP to split a string into an array according to a regular expression. The syntax format of this function is as follows:

preg_split(pattern, string, limit);

Among them, pattern is the regular expression used to match the split; string represents the string to be split; limit represents the maximum number of array elements returned. If limit is set to a negative number, all elements are returned.

The following is an example of using the preg_split function to split a string into an array:

$str = "apple,banana,orange";
$arr = preg_split("/,/", $str);

print_r($arr);

The running result is:

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

In the above example, the preg_split function is used to split the characters into an array. The string $str is split into an array $arr according to commas, which is the same as the result of using the explode function.

3. str_split function

In addition to using the explode and preg_split functions, you can also use the str_split function in PHP to convert a string into an array. The syntax format of this function is as follows:

str_split(string, length);

Among them, string represents the string to be divided; length represents the length of each substring.

The following is an example of using the str_split function to split a string into an array:

$str = "apple";
$arr = str_split($str);

print_r($arr);

The running result is:

Array
(
    [0] => a
    [1] => p
    [2] => p
    [3] => l
    [4] => e
)

In the above example, the str_split function is used to split the characters into an array. The string $str is split into an array $arr according to each character. Each element of the array is a, p, p, l and e.

To summarize, you can use the explode, preg_split and str_split functions in PHP to split a string into an array. Among them, the explode function is the most commonly used method, which can split a string into an array according to the specified delimiter. The preg_split function can split according to regular expressions, which is more flexible. Finally, the str_split function can split the string into an array per character. Depending on actual needs, choosing different functions for operation can improve the efficiency and readability of the code.

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