What should I do if php mb_substr does not execute?

Solution to php mb_substr not executing: 1. Find and open the php.ini configuration file; 2. Find the "extension=mbstring" item, and then delete the semicolon in front of the item; 3. Save php Just modify the .ini file.

The operating environment of this tutorial: Windows 10 system, PHP version 8.1, DELL G3 computer

What should I do if php mb_substr does not execute?

mb_substr () function returns a part of the string. We have learned the substr () function before. It only targets English characters. If you want to split Chinese characters, you need to use mb_substr (). mb_substr cannot be used. The biggest reason is that the ";" sign in front of "extension=mbstring" is not removed from the php.ini file.

mb_substr() introduction:

mb_substr() function returns a part of the string. We have learned the substr() function before. It only targets English characters. If you want to split Chinese characters, you need Use mb_substr().

Note: If the start parameter is negative and length is less than or equal to start, length is 0.

Syntax

mb_substr ( string $str , int $start [, int $length = NULL [, string $encoding = mb_internal_encoding() ]] ) : string

Parameters

str Required. Extracts a substring from this string.

start Required. Specifies where in the string to begin.

Positive number - starts at the specified position in the string

Negative number - starts at the specified position from the end of the string

0 - at the first character in the string Start at

length Optional. Specifies the length of the string to be returned. The default is until the end of the string.

Positive number - returned from the position of the start parameter

Negative number - returned from the end of the string

encoding Optional. Character Encoding. If omitted, the internal character encoding is used.

Return value: Returns the extracted part of the string, returns FALSE if it fails, or returns an empty string.

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