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SETUP SITE UNDER MAINTENANCE MODE


1. Enable hooks. Edit the application/config/config.php file and set

$config['enable_hooks'] = TRUE;

2. Edit the application/config/config.php file and define a new config variable for maintenance mode. Insert the following code at the bottom of the config.php file.
/*
|--------------------------------------------------------------------------
| Maintenance Mode
|--------------------------------------------------------------------------
|
| For whatever reason sometimes a site needs to be taken offline.
| Set $config['maintenance_mode'] to TRUE if the site has to be offline
|
| $config['maintenance_mode'] = TRUE; // site is offline
| $config['maintenance_mode'] = FALSE; // site is online
*/
$config['maintenance_mode'] = TRUE;

3. To let the system know about the maintenance hook, edit the application/config/hooks.php file and define hook.

    pre_system – Hook point. The hook will be called very early during system execution.

    $hook['pre_system'][] = array(
    'class'    => 'maintenance_hook', // The name of the class wish to invoke.
    'function' => 'offline_check', // The method name wish to call.
    'filename' => 'maintenance_hook.php', // The file name containing the class/function.
    'filepath' => 'hooks' // The name of the directory containing hook script.
    );

4. Create a new hook file called maintenance_hook.php in the application/hooks/ folder and write Maintenance hook script. The following code checks whether site maintenance mode is ON and load the maintenance page from application views folder.

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Check whether the site is offline or not.
 *
 */
    class Maintenance_hook
    {
        public function __construct(){
            log_message('debug','Accessing maintenance hook!');
        }
       
        public function offline_check(){
            if(file_exists(APPPATH.'config/config.php')){
                include(APPPATH.'config/config.php');
               
                if(isset($config['maintenance_mode']) && $config['maintenance_mode'] === TRUE){
                    include(APPPATH.'views/maintenance.php');
                    exit;
                }
            }
        }
    }

5. To display a well-designed maintenance page, create a maintenance.php file in the application/views/ directory and insert the HTML.

   <?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>
   <!DOCTYPE html>
   <html lang="en">
   <head>
       <meta charset="utf-8">
       <title>Site Under Maintenance</title>
       <link href="http://localhost/codeigniter/assets/css/style.css" rel="stylesheet" type="text/css" />
   </head>
   <body class="bg">
       <h1 class="head text-center">Site Under Maintenance</h1>
       <div class="container">
           <div class="content1">
               <img src="http://localhost/codeigniter/assets/images/2.png" alt="under-construction">
               <p class="text-center">Sorry for the inconvenience. To improve our services, we have momentarily shutdown our site.</p>
           </div>
       </div>
   </body>
   </html>
 
6. Enable/Disable Maintenance Mode

Now you can enable the maintenance mode (offline) by settings $config['maintenance_mode'] = TRUE;
To disable the maintenance mode (online), change it to $config['maintenance_mode'] = FALSE; 

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