Intercept Chinese string in php

1. Intercept GB2312 Chinese string

< ?php
//Intercept 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;
}
?> ;

2. Intercept the utf8 encoded multi-byte string

< ?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);
}
?>

3. Chinese character interception function supported by UTF-8 and GB2312

< ?php
/*
Utf-8 and gb2312 Chinese character interception function supported by
cut_str(string, interception length, Start length, encoding);
Encoding defaults to utf-8
Start length defaults to 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(count($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;
 }
}

$str = "abcd The string that needs to be intercepted";
echo cut_str($str, 8, 0, 'gb2312');
?>

4. BugFree’s character interception 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
 * @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 = "17test.info is at the forefront of automated testing in China";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append);
? >

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