title: Passing multiple, single or none parameters through URL cakePHP
body: <p>so I have the following controller function for adding events:</p>
  
  <pre><code>public function add($id = null, $year = null, $month = null, $day = null, $service_id = null, $project_id = null){
  ...
  }
  </code></pre>
  
  <p>What I need to do in some cases is to pass only the id and service_id or project_id and to skip the year, month and day. I have tried to pass parameters as empty strings or nulls as following, but none of it seemed to work.</p>
  
  <pre><code>echo $this-&gt;Html-&gt;link('Add event', array(
      'controller' =&gt; 'events',
      'action' =&gt; 'add',
  25, null, null, null, 3, 54
  ))
  </code></pre>
  
  <p>Any help is much appreciated.</p>