MVC (Model, View, Controller) architectural pattern.

index.php (Front controller)

// FRONT CONTROLLER
// Error settings
ini_set('display_errors',1);
//ini_set('display_errors','off');
error_reporting(E_ALL);
//error_reporting(E_NOTICE);

session_start();

// Connecting system files
define('ROOT', dirname(__FILE__));
require_once(ROOT.'/components/Autoload.php');

// Calling Router
$router = new Router(); 
$router->run();
	                     

.htaccess

AddDefaultCharset utf-8
#ErrorDocument 404 /
RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php
						

Autoload.php (Automatic class connection function)

						
function my_autoloader($class_name) 
   {
 // An array of folders in which the necessary classes can be located
    $array_paths = array(
        '/models/',
        '/components/',
        '/controllers/',
    );
 // We are looking through an array of folders
    foreach ($array_paths as $path) {

 // Formation of the name and path to the file with the class
        $path = ROOT . $path . $class_name . '.php';

 // If such a file exists, we connect it
        if (is_file($path)) {
            include_once $path;
        }
     }
   }
  spl_autoload_register('my_autoloader');						
						

Router.php (Class for working with routes)

class Router
{
     /** array of routes @var array*/
    private $routes;
	
     /** The constructor reads and remembers routes*/
    public function __construct()
    {
     // Path to the file with routes
        $routesPath = ROOT . '/config/routes.php';
     // Getting routes from a file
        $this->routes = include($routesPath);
    }
	
     /** Returns the query string*/
    private function getURI()
    {
        if (!empty($_SERVER['REQUEST_URI'])) {
            return trim($_SERVER['REQUEST_URI'], '/');
        }
    }
	
     /** Method for processing the request*/
    public function run()
    {
     // Getting the query string
        $uri = $this->getURI();
     // We check the presence of such a request in the array of routes (routes.php)
        foreach ($this->routes as $uriPattern => $path) {
     // Comparing $uriPattern and $uri
            if (preg_match("~$uriPattern~", $uri)) {
     // We get the inner path from the outer one according to the rule (regular expression)
                $internalRoute = preg_replace("~$uriPattern~", $path, $uri);
     // We define the controller, action, and request parameters
                $segments = explode('/', $internalRoute);
     // We get the controller name
                $controllerName = array_shift($segments) . 'Controller';
                $controllerName = ucfirst($controllerName);
     // We define the action
                $actionName = 'action' . ucfirst(array_shift($segments));
                $parameters = $segments;
     // We are connecting the controller class file
                $controllerFile = ROOT . '/controllers/' .
                $controllerName . '.php';
                if (file_exists($controllerFile)) {
                    include_once($controllerFile);
                }
     // We are creating a controller object
                $controllerObject = new $controllerName;
     /* We call the necessary method ($actionName) for a certain class ($controllerObject)
      * with the specified parameters ($parameters) 
      */
                $result = call_user_func_array(array($controllerObject, $actionName), $parameters);
     // If the controller method (action) is successfully called, shut down the router
                if ($result != null) {
                    break;}
            }
        }
    }
}
						

routes.php (example of an array with routes)

return array(
/** Here we write routes (!!! using regular expressions)...
 * Examples:
 * 'confirm/([0-9a-z]+)' => 'user/confirm_email/$1',
 * 'news/update/([0-9]+)/([0-9]+)' => 'news/update_news/$1/$2',
 */

// Route for the main page of the site
'index.php' => 'site/index', // actionIndex в SiteController
'' => 'site/index', // actionIndex в SiteController
);
						

SiteController.php (example of a controller)

class SiteController
{
/**
 * Action for the main page of the site
 */
	public function actionIndex()
	{
	// Getting data from the model
	$data = Site::getData();
	// Connecting the view
	require_once(ROOT . '/views/site/index.php');
	return true;
	}
}						
						

The model interacts with the database. Receives data and performs the necessary actions with it.

/**
 * The Site class is a model for SiteController
 */
class Site
{
public static function getData()
   {
      // connecting to the database 
      // executing a database query
      // getting and returning results
   }
}						
						

Here is an example of the implementation of an architectural MVC template in the PHP programming language... Be sure to use a software development methodology that prevents the introduction of vulnerabilities, provides resistance to malware and unauthorized access!