title: php define to include file
body: <p>I want to know if and how I can define a file to be included.</p>
  
  <p>for e.g. </p>
  
  <pre><code>&lt;?php
  //define('_login',inlcude('file.php'));
  define('_login',include('file.php')); // edited due to typo..
  ?&gt;
  </code></pre>
  
  <p>or would I need to do it this way</p>
  
  <pre><code>&lt;?php
  define('_login','file.php');
  include(_login);
  ?&gt;
  </code></pre>
  
  <p>the reason I ask is My site allows plugins and I want other developers to overwrite a define to include their plugin instead of the core _login define.</p>