PHP截取中文字串函數~包含GB2312和UT-8

/* 
Utf-8、gb2312都支援的漢字截取函數 
cut_str(字串, 截取長度, 開始長度, 編碼); 
編碼預設為utf-8 
開始長度預設為0/ 
*
  
function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')  
{  
    if($code == 'UTF-8') 
    if($code == 'UTF-8') 
    /[x01 -x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][ x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf    if( count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";  
      array_slice($t_string[0], $start, $sublen));  
    }  
    else  
     $sublen = $sublen*2;  
        $strlen = strlen($string);
        $tmpstr = '';  
  
        for($i=0; $i=$start && $i            {  
if(ord(substr($string, $i, 1))>129)  
                {     $i, 2);  
                }  
            {  
                    $tmpstr.= substr($ string, $i, 1);  
                }  
        $i, 1))>129) $i++;  
        }  
        if(strlen($tmpstr)        return $tmpstr;  
    }  
}  
  
$str = 「  
?>


    //移除中文字串  
   //支援GB2312 
    function mysubstr($       $strlen = $start + $len;  
for($i = 0; $i             if(ord(substr($str, $i, 1)) > 0xa0 ($str, $i, 2);  
                $i++;  
          .= substr($str, $i, 1);  
        }  
        return $tmp ?>  



//截取utf8字串  
function utf8Substr($str, $from, $len)  
{T xFF][x80-xBF]+){0,'.$from.'}'.  
                     $len.'}).*#s',  
                            );