CI框架的中uri为中文的截取方法

http://www.myfreax.com/admin/news/search/3/首部

public function search (){
   $start=$this->uri->segment(5, 0);
   $keyword=$this->uri->segment(4, 0);
   echo  $keywordd  //%E9%A6%96%E9%83%A8 将会是输出的是escape加密过的字符串，需要这个字符解密，
   $limit=3;
   if ($this->input->get('name', TRUE)) {
       $keyword=$this->input->get('name', TRUE);
       echo $keyword;
   }

     需要 定义一个函数进行解密：

   

public function unescape($str){  //注意这个函数只适合utf8编码
        $ret = '';
        $len = strlen($str);
        for ($i = 0; $i < $len; $i++){
        if ($str[$i] == '%' && $str[$i+1] == 'u'){
        $val = hexdec(substr($str, $i+2, 4));
        if ($val < 0x7f) $ret .= chr($val);
        else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f));
        else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f));
        $i += 5;
        }
        else if ($str[$i] == '%'){
        $ret .= urldecode(substr($str, $i, 3));
        $i += 2;
        }
        else $ret .= $str[$i];
        }
        return $ret;
        }

public function search (){
   $start=$this->uri->segment(5, 0);
   $keyword=$this->uri->segment(4, 0);
   $keyword=$this->unescape($keyword);
   $limit=3;
   if ($this->input->get('name', TRUE)) {
       $keyword=$this->input->get('name', TRUE);
       echo $keyword;
   }