Login Function CI3

<?php

use function PHPSTORM_META\type;

defined('BASEPATH') or exit('No direct script access allowed');

class Login extends CI_Controller
{
	public function __construct()
	{
		parent::__construct();
		$this->load->helper('hakakses');
		$this->load->model('Generalmodel', 'model');
	}

	public function index()
	{
		$ceklogin = $this->session->has_userdata('logindata');

		if ($ceklogin == TRUE)  redirect(base_url() . "dashboard");
		else $this->load->view('login/login');
	}

	public function p_login()
	{
		$user = $this->input->post('username');
		$pass = $this->input->post('password');

		$getlogin = $this->model->getDataDetail('v_login', array('username' => $user));
		if (md5($pass) == $getlogin->password) {
			$datasesionlogin = array(
				'logindata' => true,
				'id_users' => $getlogin->id_users,
				'id_profile' => $getlogin->id_profile,
				'username' => $getlogin->username,
				'type_user' => $getlogin->type_user,
				'type_user_txt' => $getlogin->type_user_txt,
				'nama' => $getlogin->nama,
			);
			$this->session->set_userdata($datasesionlogin);
			redirect(base_url());
		} else {
			$this->session->set_flashdata('pesan', '<div class="alert alert-danger">Username atau password salah</div>');
			redirect(base_url() . 'login');
		}
	}

	public function changepass()
	{
		ceklogin();

		$id_users = $this->session->userdata('id_users');
		$old_pass = $this->input->post('old_pass');
		$new_pass = $this->input->post('new_pass');

		$return = array(
			'kode' => '0',
			'header' => 'Gagal !',
			'response' => 'General Database Error',
			'tipenotif' => 'error'
		);

		$getlogin = $this->model->getDataDetail('v_login', array('id_users' => $id_users));
		if (md5($old_pass) == $getlogin->password) {
			$values['password'] = md5($new_pass);
			$db = $this->model->updateData('users', array('id_users' => $id_users), $values);
			if ($db > 0) {
				$return = array(
					'kode' => '1',
					'header' => 'Berhasil !',
					'response' => 'Password Berhasil Dirubah',
					'tipenotif' => 'success'
				);
			}
		} else {
			$return['response'] = 'Password Lama yang Anda Masukkan Salah';
		}

		echo json_encode($return);
	}

	public function logout()
	{
		$datasesilogin = array(
			'logindata',
			'id_users',
			'username',
			'type_user',
			'type_user_txt',
			'nama',
		);
		$this->session->unset_userdata($datasesilogin);
		redirect(base_url());
	}

	public function key($key)
	{
		echo md5($key);
	}
}