Php implementation of Chinese string interception without garbled characters

Source: Internet
Author: User
Tags ord strlen


Example 1

The code is as follows: Copy code

Function msubstr ($ str, $ start = 0, $ length, $ charset = "UTF-8", $ suffix = true)
    {
If (function_exists ("mb_substr "))
Return mb_substr ($ str, $ start, $ length, $ charset );
Elseif (function_exists ('iconv _ substr ')){
Return iconv_substr ($ str, $ start, $ length, $ charset );
        }
$ Re ['utf-8'] = "/[x01-x7f] | [xc2-xdf] [x80-xbf] | [xe0-xef] [x80-xbf] {2} | [xf0-xff] [x80-xbf] {3 }/";
$ Re ['gb2312'] = "/[x01-x7f] | [xb0-xf7] [xa0-xfe]/";
$ Re ['gbk'] = "/[x01-x7f] | [x81-xfe] [x40-xfe]/";
$ Re ['big5'] = "/[x01-x7f] | [x81-xfe] ([x40-x7e] | xa1-xfe])/";
Preg_match_all ($ re [$ charset], $ str, $ match );
$ Slice = join ("", array_slice ($ match [0], $ start, $ length ));
If ($ suffix) return $ slice ."... ";
Return $ slice;
    }

Example 2

The code is as follows: Copy code

<? Php
// $ Start: specifies the position where the string is to be captured. $ length specifies the length of the captured character.
Function substr2 ($ string, $ start, $ length)
{
$ Len = strlen ($ string );
If ($ len> $ length)
{
$ Str = '';
$ Len1 = $ start + $ length; // capture the original string
For ($ I = $ start; $ I <$ len1; $ I ++)
   {
If (ord (substr ($ string, $ I, 2)> 0xa0) // in ASCII, 0xa0 indicates the start of a Chinese character
    {
$ Str. = substr ($ string, $ I, 2 );
$ I ++;
    }
Else
    {
$ Str. = substr ($ string, $ I, 1 );
    }
   }
Return $ str .'...';
}
Else
{
Return $ string;
}
}

?>

Let's add a simple one with the same idea)

The code is as follows: Copy code

<? Php
Function chinesesubstr ($ str, $ start, $ len ){
$ Strlen = $ start + $ len;
For ($ I = 0; $ I <$ strlen; $ I ++ ){
If (ord (substr ($ str, $ I, 1)> 0xa0 ){
$ Tmpstr. = substr ($ str, $ I, 2 );
$ I ++;
} Else {
$ Tmpstr. = substr ($ str, $ I, 1 );
    }
   }
Return $ tmpstr;
}
$ Str = "waiting for you wait for wait you back ";
Echo chinesesubstr ($ str, 0, 19)
?>

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