Replace the index.php file at the root of the site with a new one from a backup or archive
<?php
session_start();
/**
* @author Balaji
* @name: Rainbow PHP Framework
* @copyright 2020 ProThemes.Biz
*
*/
//Application Path
define('ROOT_DIR', realpath(dirname(__FILE__)) .DIRECTORY_SEPARATOR);
define('APP_DIR', ROOT_DIR .'core'.DIRECTORY_SEPARATOR);
define('CONFIG_DIR', APP_DIR .'config'.DIRECTORY_SEPARATOR);
//Load Configuration & Functions
require CONFIG_DIR.'config.php';
require APP_DIR.'functions.php';
//Check installation
detectInstaller();
//Database Connection
$con = dbConncet($dbHost,$dbUser,$dbPass,$dbName);
//Start the Application
require APP_DIR.'app.php';
//Theme & Output
require THEME_DIR.'header.php';
require THEME_DIR.VIEW.'.php';
require THEME_DIR.'footer.php';
//Close the database conncetion
mysqli_close($con);