About CodeIgniter Facebook login controller

Home.php

public function Facebook(){
		   $userData = array();
		// Check if user is logged in
        if($this->fb_library->is_authenticated()){
            // Get user facebook profile details
            $userProfile = $this->fb_library->request('get', '/me?fields=id,first_name,last_name,email,gender,locale,picture');

            // Preparing data for database insertion
            $userData['Auth_Provider'] = 'FB';
            $userData['Auth_Id'] = $userProfile['id'];
            $userData['First_Name'] = $userProfile['first_name'];
			
            $userData['Last_Name'] = $userProfile['last_name'];
            $userData['Mobile_No'] = "";
			if(isset($userProfile['email'])){
				$userData['Email_Id'] = $userProfile['email'];
				//$userData['Hello'] = "Yes";
			}else{
				$userData['Email_Id'] = "";
				//$userData['Hello'] = "No";
			}
			$userData['Password'] = "";
			$userData['Pwd_Status'] = mt_rand(100000, 999999);
            //$userData['gender'] = $userProfile['gender'];
            //$userData['locale'] = $userProfile['locale'];
            //$userData['profile_url'] = 'https://www.facebook.com/'.$userProfile['id'];
            $userData['Picture_Url'] = $userProfile['picture']['data']['url'];

            // Insert or update user data
            $userID = $this->Social_Model->checkUser($userData);
			$this->session->set_userdata('Ses_Name', $userProfile['first_name']);
            // Check user data insert or update status
            if(!empty($userID)){
                $data['userData'] = $userData;
                $this->session->set_userdata('userData',$userData);
            }else{
               $data['userData'] = array();
            }

            // Get logout URL
            $data['logoutUrl'] = $this->fb_library->logout_url();
			$this->session->set_userdata('Fb_LogoutUrl', $this->fb_library->logout_url());
			
        }else{
            $fbuser = '';
			
            // Get login URL
            $data['authUrl'] =  $this->fb_library->login_url();
        }
		
		return $data;
	}