PHP Simple to handle the Chinese and English mixed string interception, only 2 lines of code! _php Tutorials

Referring to the Chinese and English mixed row count, interception, we first think of is the ASCII, 16 binary, regular matching, cycle count.

What I am sharing with you today is the MB extension of PHP, which teaches you how to handle strings easily.

First, we introduce the functions used:

Mb_strwidth ($STR, $encoding) returns the width of the string

$str the string to evaluate

$encoding the encoding to use, such as UTF8, GBK

Mb_strimwidth ($str, $start, $width, $tail, $encoding) to intercept a string by width

$str the string to intercept

$start where to start interception, the default is 0

$width the width to intercept

$tail append to the string behind the intercept string, commonly used is ...

$encoding the encoding to use

The following example shows you:

!--? 
  
    php 
   /*  
    * * UTF8 encoding format * 1 Chinese takes 3 bytes * We want 1 Chinese to occupy 2 bytes, * Because 2 letters are occupied from the width Position equivalent to 1 Chinese  
    */ 
   // 
    test string  
    $str  = ' aaaa ah ah aaaa ah ah aaa ' 
   ;  
    Echo  
    strlen  (
    $str ); 
   // 
    use only strlen output to 25 bytes//must specify the encoding, otherwise it will use PHP's internal code mb_internal_encoding () can view the code//use Mb_strwidth output string width of 20 using UTF8 encoding  
    echo  mb_strwidth (
    $str , ' UTF8 ' 
   );  
   // 
    intercept only if the width is greater than 10  
    if  (Mb_strwidth (
    $str , ' UTF8 ') >10 
   ) { 
   // 
    set here to intercept from 0, fetch 10 append ..., use UTF8 encode/ /Note the additional ... will also be counted within the length of  
    $str  = mb_strimwidth (
    $str , 0, ' ... ', ' UTF8 ' 
   );}  
   // 
    final output aaaa ah ... 4 A Count 4 1 Ah count 2 3 points count 3 4+2+3=9//is not very simple ah, some people said why 9 is not 10? Because just "ah" behind or "ah", Chinese count 2, 9+2=11 beyond the set, so remove one is 9  
    echo  
    $str ; 
  

Let us introduce some other functions below:

Mb_strlen ($STR, $encoding) returns the length of a string

$str the string to evaluate

Encoding used by $encoding

Mb_substr ($str, $start, $length, $encoding) intercept string

$str the string to intercept

Where do $start start the interception?

How long does the $length intercept?

Encoding used by $encoding

In fact, these 2 functions and strlen (), substr () very much like, the only difference is that you can set the encoding.

Bottom up Example:

 
  PHP/**/$str = ' aa12 ah aa '; Echo strlen ($str//  Direct output length is 9//output length is 7, why is 7? Note that after setting the code, whether it is Chinese or English each length is 1//a a 1 2 ah A//1+1+1+1+1+1+1 = 7//is exactly 7 characters Ah echo mb_strlen ($str /c13>, ' UTF8 '); // same MB_SUBSTR is the same//I only want 5 characters now echo mb_substr ($str//  output aa12 Ah

In fact, the MB extension inside a lot of useful functions, here will not give you a list.

Interested friends can view the Official Handbook

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

Well, I'll introduce you here today.

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