php - codeigniter add language flag in the end of url -

i`m using codeigniter 3.0.3 need add language flag in end of url

and on loading page need check this

// removing slash $url = rtrim($url, '/'); // checking if url $url = filter_var($url, filter_sanitize_url); // splitting $url on slashes $this->_url = explode('/', $url);  // checking if exists language if(lang::check(end($this->_url))) unset($this->_url[count($this->_url) - 1]); 

and after need send $this->_url bootstrap , route this

also need create how lang class implementing database check if flag in database...

so how can this???

this url type client

http://www.example.com/controller/function/value1/value2/value3/en

and en flag of english converted url must be

http://www.example.com/controller/function/value1/value2/value3

and en must add in session after check key lang_key

function($value1,$value2,$value3,$lang=null){  if($lang){        $newdata = array(                    'username'  => 'johndoe',                    'lang' => $lang                );  $this->session->set_userdata($newdata);  }  redirect("controller/function/$value1/$value2/$value3", 'refresh');  }