header.php

<?php
	$actual_link = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
	$path = parse_url($actual_link)['path'];
?>
<div id= "menu">
	<ul>
		<li><a class="<?php if ($path == '/home.php') { echo 'active'; }?>" href="home.php">Home</a></li>
		<li><a class="<?php if ($path == '/tv.php') { echo 'active'; }?>" href="tv.php">TV</a></li>
		<li><a class="<?php if ($path == '/watch.php') { echo 'active'; }?>" href="watch.php">Watch</a></li>
		<li><a class="<?php if ($path == '/laptop.php') { echo 'active'; }?>" href="laptop.php">laptop</a></li>
		<li><a class="<?php if ($path == '/cellphone.php') { echo 'active'; }?>" href="cellphone.php">Cellphone</a></li>
		<li><a class="<?php if ($path == '/ipad.php') { echo 'active'; }?>" href="ipad.php">ipad</a></li>
		<li class="right <?php if ($path == '/signin.php') { echo 'active'; }?>"><a href="signin.php">Sign In</a></li>
		<li class="right <?php if ($path == '/Register.php') { echo 'active'; }?>"><a href="Register.php">Register</a></li>
	</ul>
</div>