simple routing using php

/*
Here we present the simplest routing with little automation 
and easy extensibility for all projects tipes.
you can grab full example on my git hub
https://github.com/fen1979/routingExample
feel free to use it or improve it 
*/

// this file Routing.php

class Routing{
 private array $pages = array();

  	// saving parameters for redirection 
    public function addRout($url, $path)
    {
        $this->pages[$url] = $path;
    }

  // doing good :) maybee
   public function route($url)
    {
        $fileDir = $this->pages[$url];
     
		// if route path empty
        if (empty($fileDir)) {
            require 'public/404.php';
            die();
        }
		
     	// if file exist 
        if (file_exists($fileDir)) {
          // view this page
            require $fileDir;
        } else {
          // if route not empty but file not exist
            require 'public/404.php';
            die();
        }
    }
  
  // getting request parameters POST, GET no matter
  public function getUrl(): string
  {
    $arr = explode('?', $_SERVER['REQUEST_URI']);
    $url = $val = '';
    if (empty($arr)) {
      // if addres contains two slashes like /home/ 
      // this scenario prevent going to folder with same name
        $url = (count_chars($_SERVER['REQUEST_URI'], 1)[47] > 1) ?
            rtrim($_SERVER['REQUEST_URI'], '/') : $_SERVER['REQUEST_URI'];
    } else {
      // if request not contains two slashes 
      // or contains some data or anything alse
        $url = (count_chars($arr[0], 1)[47] > 1) ?
            rtrim($arr[0], '/') : $arr[0];
      // optional variable contains parameters sended in request 
      // NOTICE!!! check if exist in $arr[1] before use it
      // this val can be used only on index.php!!!
      // most time this value isn't need at ol
      // $vall = $arr[1];
    }
    return $url;
  }
}

// ----------------------------------------------------
// this file index.php

// require to use class Routing
require 'Routing.php';

// creating new instance of Routing class
$r = new Routing();

$r->addRout('/', 'views/login.php');
// set the url to route like this
$r->addRout('/home', 'views/home.php');
// exampe about page etc...
$r->addRout('/about', 'views/about/about.php');
// Here you can add any number of pages and transitions...

// getting url POST, GET no matter
$url = $r->getUrl();
// call the routing function once to view page source
$r->route($url);

// you can minify this call to 
// $r->route($r->getUrl() ?? '/')
// ==================================================== // 
/*
DESCRIPTION
The structure of the project folders and following the MVC patterns 
are not important, this example is expandable for any structural solutions, 
the example shows a partial implementation of the MVC pattern. 
The main condition for the functionality of the example is 
a single entry point into the project index.php, 
configured for nginx in the server settings, 
for Apache in the .htaccess file.

$_GET[] with some parameters:
When requests are displayed in the address bar and the parameters 
are displayed there, the parameters are used as in a regular get request, 
below is an example of accessing the about us page through <a> button 
indicating the values

on your page :
 - press tis button you go to about page
<a href="/about">About Us</a>

 - press this button about page hase be open in new tab 
<a href="/about" target="_blank" rel="nofollow" >About Us</a>

Get request in file .php
if(isset($_GET["some-name"])){
// do some actions
}

 - for request from form the action need to be empty if your request going
 - to self page scripts
<form action="" method="get">
// some inputs...
</form>

 - else if your request go to another page 
<form action="/about" method="get">
// some inputs...
</form>

the same actions fo form when method equal POST 
$_POST[] with some parameters:

When submitting a form using the post method on the page with the form, 
leave the ACTION="" attribute in the form need to be empty!!
When sending a form to another page with a transition to this page, 
enter the route for this page in the action attribute of the form

<form action="/" method="post">
// here we goin to Login.php
// some inputs...
</form>

 - receiving data from a post request in a login.php script file:
 
 if(isset($_POST["some-name])){
 // do some actions
 
 // redirection to needed page after some actions
 header("Location: /home");
 exit();
 }
 
*/



<?php

$request = $_SERVER['REQUEST_URI'];

switch ($request) {
    case '/' :
        require __DIR__ . '/views/index.php';
        break;
    case '' :
        require __DIR__ . '/views/index.php';
        break;
    case '/about' :
        require __DIR__ . '/views/about.php';
        break;
    default:
        http_response_code(404);
        require __DIR__ . '/views/404.php';
        break;
}