How to convert php numerical string to numerical array

During development, you may encounter situations where you need to convert string type values ​​into numerical type arrays, such as when processing form submissions or data imports.

In PHP, some built-in functions are provided to achieve this conversion process:

1. explode
   The explode function can split the string into an array according to the specified delimiter.

For example:

$str = "1,2,3,4,5";
$array = explode(",", $str);
print_r($array);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

2. str_split
   The str_split function can split the string into each character. Array

For example:

$str = "12345";
$array = str_split($str);
print_r($array);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

It should be noted that the str_split function may cause garbled characters and other problems when processing Chinese characters. Use other functions to solve the problem.

3. preg_split
   The preg_split function can split a string into an array based on a regular expression

For example:

$str = "1:2,3;4|5";
$array = preg_split("/[:,;|]/", $str);
print_r($array);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

When using the preg_split function, you need to pay attention to the writing of regular expressions to avoid unnecessary errors.

4. sscanf
   The sscanf function can parse a string into an array according to the specified format

For example:

$str = "1,2,3,4,5";
sscanf($str, "%d,%d,%d,%d,%d", $a, $b, $c, $d, $e);
$array = array($a, $b, $c, $d, $e);
print_r($array);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

When using the sscanf function, appropriate adjustments need to be made according to the specific conditions of the string and format to avoid parsing errors.

Summary:

The above methods can convert string type values ​​into numerical type arrays. You need to choose the appropriate method according to the actual situation. In actual development, the format and applicable scenarios of the data also need to be considered to avoid unnecessary errors and problems.

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