How to convert php string object into array

In PHP, string is one of the most commonly used data types. Usually, we need to convert a string into an array so that it can be easily manipulated and processed. PHP provides a variety of methods to achieve this goal, and this article will introduce each of these methods.

1. explode() function

explode() function is a method in PHP to split a string into an array according to the specified delimiter. The syntax of this function is:

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

Among them, $delimiter represents the delimiter, $string represents the string to be divided, $limit represents the maximum number of divisions, optional, and the default is PHP_INT_MAX.

Example:

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

Output:

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

2. str_split() function

str_split() function is to convert the string as specified A way to split the length into an array. The syntax of this function is:

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

Among them, $string represents the string to be split, $split_length represents the length of each element, optional, and the default is 1.

Example:

$string = "hello world";
$arr = str_split($string);
print_r($arr);

Output:

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

3. preg_split() function

preg_split() function uses regular expressions to A way to split a string into an array. The syntax of this function is:

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

Among them, $pattern represents a regular expression, $subject represents the string to be divided, $limit represents the maximum number of divisions, optional, and the default is -1, indicating no limit. Quantity, $flags represents matching mode, optional, default is 0.

Example:

$string = "hello, world. hello, php.";
$arr = preg_split("/[\s,.]+/", $string);
print_r($arr);

Output:

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

4. str_word_count() function

str_word_count() function is to convert the A way to convert words into arrays. The syntax of this function is:

mixed str_word_count ( string $string [, int $format = 0 [, string $charlist ]] )

Among them, $string represents the string to be split, $format represents the format of the returned result, optional, and the default is 0 (returns an array), 1 (returns the number of words), 2 (returns word and position).

Example:

$string = "hello world";
$arr = str_word_count($string, 1);
print_r($arr);

Output:

Array
(
    [0] => hello
    [1] => world
)

5. json_decode() function

json_decode() function is to convert characters in JSON format A way to convert a string into an array. The syntax of this function is:

mixed json_decode ( string $json [, bool $assoc = false [, int $depth = 512 [, int $options = 0 ]]] )

Among them, $json represents the JSON string to be converted, $assoc represents whether to return an associative array after conversion, optional, the default is false (return object), $depth represents conversion The depth, optional, defaults to 512, $options represents conversion options, optional, defaults to 0.

Example:

$string = '{"name":"apple", "price":2.5}';
$arr = json_decode($string, true);
print_r($arr);

Output:

Array
(
    [name] => apple
    [price] => 2.5
)

Summary

This article introduces five methods of converting strings into arrays in PHP, namely explode () function, str_split() function, preg_split() function, str_word_count() function and json_decode() function. Different methods are suitable for different scenarios. Developers can choose the appropriate method according to actual needs to realize the function of converting strings into arrays.

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