title: CakePHP - View Template - default values for fetched content?
body: <p>This is the example in the book, of a simple View Template</p>
  
  <pre><code>// app/View/Common/view.ctp 
  &lt;h1&gt;&lt;?php echo $this-&gt;fetch('title'); ?&gt;&lt;/h1&gt; 
  &lt;?php echo $this-&gt;fetch('content'); ?&gt;
  
  &lt;div class="actions"&gt;
      &lt;h3&gt;Related actions&lt;/h3&gt;
      &lt;ul&gt;
      &lt;?php echo $this-&gt;fetch('sidebar'); ?&gt;
      &lt;/ul&gt; &lt;/div&gt;
  </code></pre>
  
  <p>And this is how it might be extended</p>
  
  <pre><code>// app/View/Posts/view.ctp
  &lt;?php
  $this-&gt;extend('/Common/view');
  
  $this-&gt;assign('title', $post);
  </code></pre>
  
  <p>My question is: 
  <em>How can I set a default value/content for (let's say) the <strong>title</strong>, in order to overwrite if needed ?</em></p>
  
  <p>Thank you!</p>