------------------------------
LOGIN CONTROLLER
------------------------------
public function login()

	{

			$this->load->view('login');
			$this->load->model('user_model');
			$fetch = $this->user_model->login_user();

			if($fetch){

				$this->load->view('success');
			}
			else{
				$this->load->view('unsuccess');
			}

	}

------------------------------------------
LOGIN MODEL
------------------------------------------

public function login_user(){

		$password = $this->input->post('psw');
		$this->db->select('password');
		$this->db->from('user');
		$this->db->where('password', password_hash($password, PASSWORD_DEFAULT)); //hash pass
		$query = $this->db->get();

		$res = $query->result_array();
		if($this->isAccountExist() == false){
			if($query->num_rows() > 0){
					$_SESSION['userid'] = $res['user_id'];
					$_SESSION['logged'] = true;
				return true;

			}else{
				$_SESSION['message'] = "Incorrect username/password combination.";
				return false;
			}
		}else{

			$_SESSIOn['message'] == "Account doesn't exists.";
			return false;
		}

	}

	public function isAccountExist(){

		$username = $this->input->post('userid');
		$this->db->select('username');
		$this->db->from('user');
		$this->db->where('username', $username);
		$query = $this->db->get();
		if($query->num_rows() > 0){
			return true;

		}else{
			return false;
		}

	}