title: leaving unused use statements in php
body: <p>In symfony2 when I use console to generate a controller, symfony2 imports some classes using use statement, which sometimes I don't use in the actual code, for example:</p>
  
  <pre><code>use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
  use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
  </code></pre>
  
  <p>what is the impact of leaving them, should I delete them.</p>
  
  <p>I just don't tend to delete them, in case I needed them in later phase.</p>