Function to intercept Chinese characters-csubstr

//--------------------------------- ------------------
//Function name: csubstr
//Function: truncate string, one Chinese character counts as two characters, and English character counts as one character
//For GBK (GB2312) encoded website
 // Parameters: $str ---- original string
 // $start ---- starting length
 // $len ---- intercepted length
 // Return value: intercepted The last string
//Organized by: itlearner
//---------------------------------------- ----------------
function csubstr($str, $start, $len)
{
if ($len >= strlen( $str)) return $str;
$tmpstr = "";
$len= ($len < strlen($str)) ? $len : strlen($str);
for ($i= $start; $ i < $len; $i ++)
{
if (ord(substr($str, $i, 1)) > 0xa0)
{
$tmpstr .= substr($str, $i, 2) ;
$i ++;
} else
{
$tmpstr .= substr($str, $i, 1);
}
}
$tmpstr .= "...";
return $tmpstr;
}
?>