gistfile1.php

  <nav id="subPageNav">
<?php
// Grab the categories - top level only (depth=1)
 $get_cats = wp_list_categories( 'echo=0&title_li=&depth=1' );
// Split into array items
 $cat_array = explode('</li>',$get_cats);
// Amount of categories (count of items in array)
 $results_total = count($cat_array);
// How many categories to show per list (round up total divided by 5)
 $cats_per_list = ceil($results_total / 5);
// Counter number for tagging onto each list
 $list_number = 1;
// Set the category result counter to zero
 $result_number = 0;
 
 
?>
<ul id="filters"> 
<li><a href="#" data-filter="*">Show All</a></li>
<?php 
$args=array(
  'orderby' => 'name',
  'order' => 'ASC'
  );
$categories=get_categories($args);
  foreach($categories as $category) { 
  ?> 
  <li><a href="#" data-filter=".category-<?php echo $category->slug; ?>"><?php echo $category->name; ?></a></li>
  <?php } ?>
  </ul>