PHP FUNCTION FOR INTERCEPTION CHINESE

from: http://www.nowamagic.net/librarys/veda/detail/986

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)  
{  
    if(function_exists("mb_substr")){   
    if($suffix)   
      return mb_substr($str, $start, $length, $charset)."...";  
      else  
      return mb_substr($str, $start, $length, $charset);   
       }  
    elseif(function_exists('iconv_substr')) {  
        if($suffix)   
       return iconv_substr($str,$start,$length,$charset)."...";  
       else  
       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;  
}

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