Php simply intercepts a mix of Chinese and English strings. Only two lines of code are required!

When talking about Chinese and English mixed sorting and truncation, we first think of ascii, hexadecimal, regular matching, and cyclic counting.

Today, I want to share with you how to easily process strings through the mb extension of php.

 

First, we will introduce the functions used:

Mb_strwidth ($ str, $ encoding) returns the string width.

$ Str string to be calculated

$ Encoding used by encoding, such as utf8 and gbk

Mb_strimwidth ($ str, $ start, $ width, $ tail, $ encoding) truncates a string by its width.

$ Str string to be truncated

$ Start: Where to start the truncation. The default value is 0.

$ Width: the width to be truncated.

$ Tail appends the string to the string behind the truncated string, which is commonly used...

$ Encoding used by encoding

 

The following is an example:

<? Php/*** utf8 encoding format * 1 Chinese Character occupies 3 bytes * What we want is that 1 Chinese Character occupies 2 bytes, * From the aspect of width, the positions occupied by the two English letters are equivalent to one Chinese character * // test string $ str = 'aaaa, aaaa, aaa '; echo strlen ($ str); // only use strlen to output 25 bytes. // The encoding must be specified. Otherwise, the php internal code mb_internal_encoding () will be used () you can check the internal code // use mb_strwidth to output the string width to 20 using utf8 encoding echo mb_strwidth ($ str, 'utf8 '); // if (mb_strwidth ($ str, 'utf8')> 10) is intercepted only when the width is greater than 10. {// The value starts from 0 and 10 are appended ..., use utf8 encoding // note the append... it is also calculated to be within the length $ str = mb_strimwidth ($ str, 0, 10 ,'... ', 'utf8');} // finally output aaaa... 4 a, 4, 1, 2, 3, 3, 4, 2, 3, 3, 4, 2, 3, = 9 // is it easy, some people have said why 9, not 10? // Because "ah" is followed by "ah", the number of Chinese characters is counted as 2. 9 + 2 = 11 has exceeded the setting. Therefore, if one character is removed, the value of echo $ str is 9;

 

 

I will introduce some other functions below:

Mb_strlen ($ str, $ encoding) returns the length of the string.

$ Str string to be calculated

$ Encoding used by encoding

Mb_substr ($ str, $ start, $ length, $ encoding) intercepts a string

$ Str string to be truncated

$ Start

$ Length

$ Encoding used by encoding

In fact, these two functions are very similar to strlen () and substr (). The only difference is that encoding can be set.

 

Bottom edge instance:

<? Php/*** utf8 encoding format * 1 Chinese Character occupies 3 bytes */$ str = 'aa12 Ah a'; echo strlen ($ str ); // The direct output length is 9 // The output length is 7. Why is it 7? // Note that after encoding is set, whether it is Chinese or English, each length is 1 // a 1 2 Ah a // 1 + 1 + 1 + 1 + 1 + 1 + 1 = 7 // is it exactly 7? echo mb_strlen ($ str, 'utf8'); // The same is true for the same mb_substr // I only want 5 characters to echo mb_substr ($ str, 0, 5, 'utf8 '); // output aa12

 

 

In fact, there are a lot of useful functions in the mb extension. I will not list them here.

If you are interested, you can view the official manual.

Http://www.php.net/manual/zh/ref.mbstring.php

Now, we will introduce you here today.