The document describes a login system using CodeIgniter sessions. It defines a LoginController with methods for login, logout, and welcome views. The login method loads a login view with a form submitting to the check method. The check method validates the username and password and sets a session on success, loading the welcome view. The logout method unsets the session and redirects to login. The welcome method loads if a session exists, otherwise redirects to logout.

1. Login simplu cu sesiuni

2. /application/config/autoload.php
$autoload['libraries'] = array('session');
$autoload['helper'] = array('url','html','form');

3. /application/config/routes.php
$route['default_controller'] = 'LoginController';

4. LoginController
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class LoginController extends CI_Controller {
public function index(){
$this->load->view('login');
}
public function check(){
$username=$this->input->post('username');
$password=$this->input->post('password');
if($username=='Popescu'&&$password=='Bogdan'){
$this->session->set_userdata(array('username'=>$username));
$this->load->view('welcome');
}else{
$data['error']='Error message!!!';
$this->load->view('login',$data);
}
}

5. public function logout(){
$this->session->unset_userdata('username');
redirect('LoginController');
}
public function welcome(){
if($this->session->userdata('username')){
$this->load->view('welcome');
}else
redirect('LoginController/logout');
}
}

6. /views/login.php
<?php
//$this->load->helper('form');
echo isset($error)?$error:'';
echo form_open('LoginController/check');
$data1 = ['name' => 'username',
'id' => 'text1',
'maxlength' => '100',
'size' => '30',
];
$data2 = ['name' => 'password',
'id' => 'text2',
'maxlength' => '100',
'size' => '30',
];
$data3 = array(
'name' => 'button',
'id' => 'button',
'value' => 'true',
'type' => 'reset',
'content' => 'Reset'
);

7. <?php echo form_fieldset('Login'); ?>
<table>
<tr>
<td><?php echo form_label('Username ', 'text1');?></td>
<td><?php echo form_input($data1);?></td>
</tr>
<tr>
<td><?php echo form_label('Password ', 'text2');?></td>
<td><?php echo form_input($data2);?></td>
</tr>
<tr>
<td><?php echo form_submit('submit', 'Login');?></td>
<td><?php echo form_button($data3);?></td>
</tr>
</table>
<?php echo form_fieldset_close();?>
<?php echo form_close();?>

8. /views/welcome.php
<?php
echo 'Welcome '.$this->session->userdata('username').'!';
echo '<br>';
echo anchor('LoginController/logout','Logout');
?>