highlight the current page in menu in php

Question

I wanted to make an active page highlighted in the menu using PHP. The page is in a static version.

navigation.php

<div class="collapse navbar-collapse" id="navbar-collapse-1">
                    <ul class="nav navbar-nav">
                        <li class="active"><a href="index.php">Home</a></li>
                        <li><a href="contact-us.php">Contact</a></li>
                    </ul>
                </div>

index.php

<?php
// Including Files
include('includes/header.php');
include('includes/navigation.php');
?> Rest HTML code goes here

Can someone please help me do this?