title: define and heredoc
body: <p>How do you use <a href="http://php.net/manual/en/function.define.php" rel="noreferrer">define</a> within a <a href="http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc" rel="noreferrer">heredoc</a>? For example:</p>
  
  <pre><code>define('PREFIX', '/holiday');
  
  $body = &lt;&lt;&lt;EOD
  &lt;img src="PREFIX/images/hello.png" /&gt;   // This doesn't work.
  EOD;
  </code></pre>