title: Routing: 'admin' => true vs 'prefix' => 'admin in CakePHP
body: <p>Hi I'm setting up admin routing in CakePHP.</p>
  
  <p>This is my current route:</p>
  
  <pre><code>Router::connect('/admin/:controller/:action/*', array('admin' =&gt; true, 'prefix' =&gt; 'admin', 'controller' =&gt; 'pages', 'action' =&gt; 'display', 'home'));
  </code></pre>
  
  <p>It works fine, but I don't understand what the difference between 'admin' => true, and 'prefix' => 'admin' is.</p>
  
  <p>When I omitted <code>'prefix' =&gt; 'admin'</code>, the router wouldn't use <code>admin_index</code> and would instead just use <code>index</code>. So what's the point of <code>'admin' =&gt; true</code>?</p>