title: modulus operator to run 1st and then every 3rd item
body: <p>So i need it to run on the first loop and then every 3rd loop</p>
  
  <pre><code>if ($k % 3 || $k==1 ) { echo '&lt;div class="modcontainer"&gt;'; } 
  </code></pre>
  
  <p>Seems simple to me, but i don't have the understanding of modulus</p>