What are the php mb extension functions?

Commonly used php mb extension functions include "mb_strlen", "mb_strpos", "mb_substr", "mb_convert_encoding", "mb_convert_case", "mb_strtoupper", "mb_strtolower", "mb_detect_encoding", "mb_internal_encoding" and " mb_http_output" etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP, the mb extension function is a set of functions for processing multi-byte strings. These functions can handle various different character encodings, such as UTF-8, GBK, etc. Using the mb extension function, strings containing multi-byte characters such as Chinese, Japanese, Korean, etc. can be easily processed.

The following are some commonly used mb extension functions:

1. mb_strlen(string $str, string $encoding = null): Returns the length of the specified string. You can specify the encoding method of the string. If not specified, the internal encoding method will be used by default.

2. mb_strpos(string $haystack, string $needle, int $offset = 0, string $encoding = null): Search the given string for the specified substring and return the first occurrence. You can specify the starting position and encoding of the search.

3. mb_substr(string $str, int $start, int $length = null, string $encoding = null): Returns the substring of the specified string. You can specify the starting position, length and encoding of the substring.

4. mb_convert_encoding(string $str, string $to_encoding, mixed $from_encoding = null): Convert the encoding of a string to the specified encoding.

5. mb_convert_case(string $str, int $case = MB_CASE_UPPER, string $encoding = null): Converts the character case in the specified string to the specified case. You can specify the case and encoding of the conversion.

6. mb_strtoupper(string $str, string $encoding = null): Convert characters in the specified string to uppercase. Encoding method can be specified.

7. mb_strtolower(string $str, string $encoding = null): Convert characters in the specified string to lowercase. Encoding method can be specified.

8. mb_detect_encoding(string $str, mixed $encoding_list = null, bool $strict = false): Detect the encoding of a string. You can specify a list of encoding methods and whether to use strict mode.

9. mb_internal_encoding([string $encoding = null]): Gets or sets the internal encoding method. If the encoding method is specified, the internal encoding method will be set; if the encoding method is not specified, the current internal encoding method will be returned.

10. mb_http_output([string $encoding = null]): Gets or sets the HTTP output encoding method. If the encoding method is specified, the HTTP output encoding method will be set; if the encoding method is not specified, the current HTTP output encoding method will be returned.

The above are some commonly used mb extension functions. By using these functions, you can handle multi-byte strings more flexibly and ensure correct character encoding. This is very useful for processing strings containing non-ASCII characters, such as in international website development where content in different languages ​​often needs to be processed. .

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