Add class="active" to active page using PHP

Figured out the ANSWER...I was over thinking it.

HTML

<ul id="mainnav">
    <li class="<?php if ($first_part=="") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Home</a></li>
    <li class="<?php if ($first_part=="tutorials") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Tutorials</a></li>
    <li class="<?php if ($first_part=="resources") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Resources</a></li>
    <li class="<?php if ($first_part=="library") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Library</a></li>
    <li class="<?php if ($first_part=="our-projects") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Our Projects</a></li>
    <li class="<?php if ($first_part=="community") {echo "active"; } else  {echo "noactive";}?>"><a href="#">Community</a></li>
</ul>

PHP

<?php 
$directoryURI = $_SERVER['REQUEST_URI'];
$path = parse_url($directoryURI, PHP_URL_PATH);
$components = explode('/', $path);
$first_part = $components[1];
?>

Maybe this helps you:

$(document).ready(function()
{
    var parts = document.URL.split("/");
    // [http:, empty, your domain, firstfolder]
    var firstFolder = parts[3];

    $("#mainnav li").attr("class", "noactive");
    $("#mainnav a[href='/" + firstFolder + "/']").parent().attr("class", "active");
});

Through PHP you can try -

<?php 
// gets the current URI, remove the left / and then everything after the / on the right
$directory = explode('/',ltrim($_SERVER['REQUEST_URI'],'/'));

// loop through each directory, check against the known directories, and add class   
$directories = array("index", "tutorials","resources","library","our-projects","community"); // set home as 'index', but can be changed based of the home uri
foreach ($directories as $folder){
$active[$folder] = ($directory[0] == $folder)? "active":"noactive";
}
?>

<ul>
  <li class="<?php echo $active['index']?>"><a href="/">Home</a></li>
  <li class="<?php echo $active['tutorials']?>"><a href="/tutorials/">Tutorials</a></li>
  <li class="<?php echo $active['resources']?>"><a href="/resources/">Resources</a></li>
  <li class="<?php echo $active['library']?>"><a href="/library/">Library</a></li>
  <li class="<?php echo $active['our-projects']?>"><a href="/our-projects/">Our Projects</a></li>
  <li class="<?php echo $active['community']?>"><a href="/community/">Community</a></li>
</ul>

header.php

$activePage = basename($_SERVER['PHP_SELF'], ".php");

nav.php

<ul>
    <li class="<?= ($activePage == 'index') ? 'active':''; ?>"><a href="/index.php">Home</a></li>
    <li class="<?= ($activePage == 'tutorials') ? 'active':''; ?>"><a href="/tutorials.php">Tutorials</a></li>
...