How to convert string to array in php

In PHP, string is a very common data type. In practical applications, we often need to convert strings into arrays for operations. How to convert string to array in PHP? This article will introduce it to you in detail.

1. Use the explode function

The explode function is the easiest way to split a string into an array. This function uses a delimiter to split the original string into an array of multiple elements. The syntax format is as follows:

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

Parameter description:

• $delimiter: delimiter, which can be a string or a regular expression
• $string: The string to be split
• $limit: Optional parameter, set the maximum number of returned array elements

For example, if we need to convert the comma-separated string "apple,banana,orange" into an array, we can use the following code:

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

The output result is:

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

2. Use str_split Function

The str_split function is another way to convert a string into an array. This function splits a string into an array of multiple elements according to the specified length. The syntax format is as follows:

array str_split(string $string[, int $split_length]);

Parameter description:

• $string: The string to be split
• $split_length: Optional parameter, set the length of division, the default is 1

For example, if we need to convert the string "hello" into an array, we can use the following code:

$str = "hello";
$arr = str_split($str);
print_r($arr);

The output result is:

Array
(
    [0] => h
    [1] => e
    [2] => l
    [3] => l
    [4] => o
)

3. Use preg_split function

The preg_split function is a function that can split a string into an array based on a regular expression. The syntax format is as follows:

array preg_split(string $pattern, string $subject[, int $limit = -1[, int $flags = 0]]);

Parameter description:

• $pattern: Regular expression
• $subject : The string to be split
• $limit: Optional parameter, set the maximum number of returned array elements
• $flags: Optional Parameters, setting options

For example, if we need to convert the string "hello world,php is cool" separated by spaces and commas into an array, we can use the following code:

$str = "hello world,php is cool";
$arr = preg_split("/[\s,]+/", $str);
print_r($arr);

The output result is:

Array
(
    [0] => hello
    [1] => world
    [2] => php
    [3] => is
    [4] => cool
)

Summary

Converting a string to an array is one of the basic operations commonly used in PHP, which can be implemented using functions such as explode, str_split and preg_split. No matter which method is used, it can help us complete development tasks quickly and efficiently. It should be noted that when using the preg_split function, you need to have a certain grasp of regular expressions to better achieve string splitting. Hope this article can be helpful to you.

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