title: PHP GET, if / esle
body: <p>What's wrong with this code:</p>
  
  <pre><code>&lt;?php
  if ($_GET['variable'] == "a") {
      $variable = "a";
  }
  else {
      $variable = "b" 
  }
  echo $variable;
  ?&gt;
  </code></pre>
  
  <p>I get an internal server error.</p>