Basic PHP router

index.php (main file):

<?php
	
	// config
	include "config.php";
	
	// functions
	include "functions.php";
	
	// page router
	if(isset($_GET["page"])) {
		
		if(in_array($_GET["page"], PAGES)) {
			$page = $_GET["page"];
		} else {
			redirect("404");
		}
		
	} else {
		$page = HOME;
	}
	
	if($page=="404") {
		header("HTTP/1.0 404 Not Found");
	}
	
	// titles, meta descriptions
	include "meta.php";
	
	// page rendering
	include "templates/header.php";
	include "pages/$page.php";
	include "templates/footer.php";

?>

config.php (website config):

<?php

	// URI
	define("URI", "http://example.com/");
	
	// homepage
	define("HOME", "home");
	
	// allowed pages
	define("PAGES", 
		array(
			"about",
			"contact",
			"404"
		)
	);

URI: website address (change it to your own).
HOME: homepage.
PAGES: allowed pages besides the homepage.

home, about, contact, 404 - all these are filenames without extension and all of them are placed in the pages folder. For example, pages/home.php, pages/about.php, pages/contact.php, ...

functions.php:

<?php

	function redirect($page = HOME) {
		if($page==HOME) {
			header("Location: ".URI);
		} else {
			header("Location: ".URI."?page=$page");
		}
		die();
	}

Router:

	// router
	if(isset($_GET["page"])) {
		
		if(in_array($_GET["page"], PAGES)) {
			$page = $_GET["page"];
		} else {
			redirect("404");
		}
		
	} else {
		$page = HOME;
	}

If the variable $_GET["page"] is set (if(isset($_GET["page"])) {) then check if it belongs to one of the allowed pages (if(in_array($_GET["page"], PAGES)) {). If the condition is true then accept the page ($page = $_GET["page"]), if not - then redirect to 404 page (redirect("404")). In case if the variable $_GET["page"] is not set, we set our site to homepage ($page = HOME).

Issuing a "HTTP/1.0 404 Not Found" header for a 404 page:

	if($page=="404") {
		header("HTTP/1.0 404 Not Found");
	}

meta.php (titles and meta descriptions of pages):

<?php

	$title["home"] = "Homepage";
	$title["about"] = "About Us";
	$title["contact"] = "Contacts";
	$title["404"] = "404 - Page Not Found";
	
	$meta_descr["home"] = "Homepage meta description";
	$meta_descr["about"] = "Meta description about us...";

Meta descriptions may not be added for all pages.

Page rendering:

	// page rendering
	include "templates/header.php";
	include "pages/$page.php";
	include "templates/footer.php";

header.php:

Loading page title and meta-description:

	<title><?php echo $title[$page]; ?></title>
	<?php if(isset($meta_descr[$page])) { ?>
	<meta name="description" content="<?php echo $meta_descr[$page]; ?>">
	<?php } ?>

Loading styles:

	<link rel="stylesheet" href="<?php echo URI; ?>styles.css">

	<ul class="nav col-12 col-lg-auto me-lg-auto mb-2 justify-content-center mb-md-0">
		<li><a href="<?php echo URI; ?>" class="nav-link px-2 text-<?php if($page=="home") echo "secondary"; else echo "white"; ?>">Home</a></li>
		<li><a href="<?php echo URI; ?>?page=about" class="nav-link px-2 text-<?php if($page=="about") echo "secondary"; else echo "white"; ?>">About</a></li>
		<li><a href="<?php echo URI; ?>?page=contact" class="nav-link px-2 text-<?php if($page=="contact") echo "secondary"; else echo "white"; ?>">Contact</a></li>
	</ul>

The complete code can be found here: https://github.com/yulwebdev/basic-php-router

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