Chinese character string Truncation in various PHP Codes

Although PHP has a ready-made string truncation function substr (), this function cannot intercept Chinese character strings. To achieve this effect, we need to write the corresponding functions ourselves. There are a variety of Chinese character encoding, such as GB2312, UTF-8, Chinese character string interception needs to distinguish this Chinese character encoding, the following is a few solutions.

Truncates GB2312 Chinese strings.

<? Php // intercept the Chinese string-function mysubstr ($ str, $ start, $ len) {$ tmpstr = ""; $ 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 ;}?>

Truncates UTF-8 encoded multi-byte strings.

<? Php // intercept the utf8 string function utf8Substr ($ str, $ from, $ len) {return preg_replace ('# ^ (? : [\ X00-\ x7F] | [\ xC0-\ xFF] [\ x80-\ xBF] +) {0 ,'. $ from. '}'. '((? : [\ X00-\ x7F] | [\ xC0-\ xFF] [\ x80-\ xBF] +) {0 ,'. $ len. '}). * # s', '$ 1', $ str) ;}?>

Chinese character truncation functions supported by UTF-8 and GB2312

<? Php/* Utf-8, gb2312 are supported by the Chinese character truncation function cut_str (string, truncation length, start length, encoding ); the default encoding start length is UTF-8. The default value is 0 */function cut_str ($ string, $ sublen, $ start = 0, $ code = 'utf-8 ') {if ($ code = 'utf-8 ') {$ pa = "/[\ x01-\ x7f] | [\ xc2-\ xdf] [\ x80-\ xbf] | \ xe0 [\ xa0-\ xbf] [\ x80-\ xbf] | [\ xe1-\ xef] [\ x80-\ xbf] [\ x80-\ xbf] | \ xf0 [\ x90-\ xbf] [\ x80 -\ xbf] [\ x80-\ xbf] | [\ xf1-\ xf7] [\ x80-\ xbf] [\ x80-\ xbf] [\ x80-\ xbf] /"; preg_match_all ($ pa, $ string, $ t_string); if (co Unt ($ t_string [0])-$ start> $ sublen) return join ('', array_slice ($ t_string [0], $ start, $ sublen )). "... "; return join ('', array_slice ($ t_string [0], $ start, $ sublen);} else {$ start = $ start * 2; $ sublen = $ sublen * 2; $ strlen = strlen ($ string); $ tmpstr = ''; for ($ I = 0; $ I <$ strlen; $ I ++) {if ($ I >=$ start & $ I <($ start + $ sublen) {if (ord (substr ($ string, $ I, 1)> 129) {$ tmpstr. = substr ($ string, $ I, 2 );} Else {$ tmpstr. = substr ($ string, $ I, 1) ;}if (ord (substr ($ string, $ I, 1)> 129) $ I ++ ;} if (strlen ($ tmpstr) <$ strlen) $ tmpstr. = "... "; return $ tmpstr ;}}$ str =" string to be intercepted by abcd "; echo cut_str ($ str, 8, 0, 'gb2312');?>

BugFree character truncation Function

<?php/*** @package     BugFree* @version     $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $*** Return part of a string(Enhance the function substr())** @author                  Chunsheng Wang <[email]wwccss@263.net[/email]>* @param string $String the string to cut.* @param int     $Length the length of returned string.* @param booble $Append whether append "...": false|true* @return string           the cutted string.*/function sysSubStr($String,$Length,$Append = false){    if (strlen($String) <= $Length )    {        return $String;    }    else    {        $I = 0;        while ($I < $Length)        {            $StringTMP = substr($String,$I,1);            if ( ord($StringTMP) >=224 )            {                $StringTMP = substr($String,$I,3);                $I = $I + 3;            }            elseif( ord($StringTMP) >=192 )            {                $StringTMP = substr($String,$I,2);                $I = $I + 2;            }            else            {                $I = $I + 1;            }            $StringLast[] = $StringTMP;        }        $StringLast = implode("",$StringLast);        if($Append)        {            $StringLast .= "...";        }        return $StringLast;    }}$String = "www.bkjia.com";$Length = "18";$Append = false;echo sysSubStr($String,$Length,$Append);?>