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English
In PHP programming, str_split() is a commonly used function that splits strings into arrays by specified lengths. However, the str_split() function will have different behaviors when dealing with non-ASCII characters, especially multi-byte characters. Multi-byte characters (such as Chinese, Japanese, Korean, etc.) occupy multiple bytes in computer memory, while ASCII characters usually only occupy one byte per character. Due to this difference, str_split() may have problems splitting multibyte characters.
The syntax of the str_split() function is as follows:
array str_split ( string $string [, int $length = 1 ] )
$string : The input string to be split.
$length : Specifies the length of each substring, default is 1.
For example, a simple example:
$string = "hello";
$result = str_split($string, 2);
print_r($result);
Output:
Array
(
[0] => he
[1] => ll
[2] => o
)
When we deal with multibyte characters (such as Chinese characters), str_split() is less ideal. Suppose we have a string containing Chinese characters:
$string = "Hello World";
$result = str_split($string, 2);
print_r($result);
Output:
Array
(
[0] => you
[1] => good
[2] => world
[3] => boundary
)
Although it seems like no problem, in fact, the processing of internal strings of PHP is done based on bytes, not characters. A Chinese character is usually represented by multiple bytes, but str_split() processes them as bytes. This can lead to wrong splitting, especially when encountering the middle of multibyte characters.
To properly handle multibyte characters, PHP provides a function called mb_str_split() , which is part of a multibyte string extension. It handles characters correctly, rather than simply splitting by bytes. Its syntax is similar to str_split() :
array mb_str_split ( string $string [, int $length = 1 [, string $encoding = null ]] )
$string = "Hello World";
$result = mb_str_split($string, 2);
print_r($result);
Output:
Array
(
[0] => you
[1] => good
[2] => world
[3] => boundary
)
By using mb_str_split() we can ensure that each character is processed correctly without errone cuts incorrectly.
If you need to process the URL in the code, we can use str_replace() to replace the domain name part of the URL. For example:
$url = "https://example.com/path/to/resource";
$new_url = str_replace("example.com", "m66.net", $url);
echo $new_url;
Output:
