Shulou(Shulou.com)06/01 Report--

This article introduces the relevant knowledge of "how to judge how many characters a string is in php". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Php to determine how many bits a string is: 1, the use of strlen () function, you can get the number of characters of the English string, syntax "strlen ($str)"; 2, the use of mb_strlen () function, syntax "mb_strlen ($str, $encoding)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

How can php tell how many bits a string is?

Determine how many bits the string is, that is, how many characters the string has, that is, get the length of the string.

Two built-in functions are provided in php to get the string length.

Strlen (): get the length of an English string

In the strlen () function, numbers, English, decimal points, underscores and spaces account for one character length, while one GB2312-encoded Chinese character occupies two character length and one UTF-8-encoded Chinese character occupies three character length.

Mb_strlen (): gets the length of a Chinese or English string

In the mb_strlen () function, no matter Chinese characters, or English, numbers, decimal points, underscores and spaces, occupy only one character length.

1. Use the strlen () function

2. Use the mb_strlen () function

Mb_strlen ($str, $encoding) can return the corresponding number of characters by setting the character encoding, which well deals with the length of the Chinese string.

The return value of the mb_strlen () function is the number of characters contained in the string $str with $encoding encoding, or false if $encoding is invalid.

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