How to convert string into string array in php

In the PHP development process, converting strings into string arrays is a very common operation. For beginners, this can be confusing. This article will introduce several common methods of converting strings into string arrays, and attach sample codes.

Method 1: Use the explode() function

The explode() function can split a string into multiple elements according to the specified delimiter, and then return an array composed of these elements.

Sample code:

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

Output result:

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

Method 2: Use str_split() function

str_split() function can convert a string into Splits the specified length into multiple elements and returns an array of these elements. If the length is not specified, it defaults to 1.

Sample code:

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

Output result:

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

Method 3: Use regular expressions

If you need to split the string according to certain rules, Regular expressions can be used. The preg_split() function can split a string into multiple elements according to the specified regular expression, and then return an array of these elements.

Sample code:

$str = "123abc456def789";
$arr = preg_split('/\d+/', $str);
print_r($arr);

Output result:

Array
(
    [0] => 
    [1] => abc
    [2] => def
    [3] => 
)

In the above code, the regular expression "/\d /" represents one or more numbers. So, this code will split the string by numbers.

Method 4: Manually split the string

This is the most basic method, which is to manually traverse the string and take out the required part each time. This method is more cumbersome, but it can meet the needs of some special circumstances.

Sample code:

$str = "google";
$arr = array();
for ($i = 0; $i < strlen($str); $i++) {
    $arr[] = $str[$i];
}
print_r($arr);

Output result:

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

Summary

In PHP development, converting a string into a string array is a basic operation . This article introduces four common methods, including using the explode() function, str_split() function, regular expressions, and manually traversing the string. Readers can choose the appropriate method to convert strings into string arrays according to their own needs.

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