title: What's better, isset or not?
body: <p>Is there any speed difference between</p>
  
  <pre><code>if (isset($_POST['var']))
  </code></pre>
  
  <p>or</p>
  
  <pre><code>if ($_POST['var'])
  </code></pre>
  
  <p>And which is better or are they the same?</p>