$folders = array_filter(glob('*'), 'is_dir');

<div class="navbar navbar-inverse navbar-fixed-top">

<div class="navbar-inner">

<div class="container">

<button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">

<span class="icon-bar"></span>

<span class="icon-bar"></span>

<span class="icon-bar"></span>

</button>

<a class="brand" href="/index.php">Playground</a>

<div class="nav-collapse collapse">

<ul class="nav">

<li><a href="/index.php">Home</a></li>

<?php foreach($folders as $folder) :?>

<li><a href="/index.php/<?php echo $folder; ?>"><?php echo ucfirst($folder); ?></a></li>

<?php endforeach; ?>

</ul>

</div><!--/.nav-collapse -->

</div>

</div>

</div>