如何使用CURL lib从数据库发送URL？

Question

I am trying to get data from Multiple URLs but when i give the dynamic URL to CURL lib it will return me #null. if give the hard single code URL it's return me the data.

 public function index() 
   {
          $id="1234567899555";
            $data=$this->db->select('*')->from('URL')->where('is_delete',0)->get()->result();
       foreach($data as $values){

            $URL=$values->URL.$id;
            //var_dump($URL); die();

            $cSession = curl_init(); 
            //step2
            curl_setopt($cSession,CURLOPT_URL, $URL);
            curl_setopt($cSession,CURLOPT_RETURNTRANSFER,true);
            curl_setopt($cSession,CURLOPT_HEADER, false); 
            //var_dump(CURLOPT_URL); die();
            //step3
            $result=curl_exec($cSession);
            //step4
            curl_close($cSession);
            //step5
            //var_dump($result); die();
            $slm=json_decode($result);    
            var_dump($slm); die();  

       }




   }