How php calculates a few characters

This article mainly introduces "php how to calculate a few characters", in daily operation, I believe many people in php how to calculate a few characters on the problem there are doubts, Xiaobian consulted all kinds of information, sorted out simple and easy to use operation methods, hope to answer "php how to calculate a few characters" doubts helpful! Next, please follow the small series to learn together!

Php calculates several characters: 1. Get the length of a given string through the strlen function;2. Use the mb_strlen function to get the number of string characters.

Operating environment: Windows 7 system, PHP 7.4 version, Dell G3 computer.

How does php count a few characters?

PHP Number of characters

Sometimes, for example, to register a user, you need to check the length of the user name. The following two functions may be used to make a judgment.

strlen

int strlen ( string $string )

Returns the length of a given string.

Note: It returns the number of bytes in the string, not the number of characters. Suppose a Chinese character "you" may return 3, depending on what code you use.

mb_strlen

int mb_strlen ( string $str [, string $encoding ] )

Returns the number of characters in a string.

str

concrete string

encoding

The encoding parameter is character encoding. If omitted, internal character encoding is used.

Note: Be sure to open php_mbstring.dll in the php.ini file,

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