title: Is "including" functions officially supported in PHP?
body: <p>I'm working with <a href="https://github.com/roots/sage" rel="nofollow">Sage from roots.io</a> and noticed that they are <a href="https://github.com/roots/sage/blob/master/base.php#L24" rel="nofollow">"including" functions</a> (not files), like: </p>
  
  <pre><code>&lt;?php include Namespace\Function(); ?&gt;
  </code></pre>
  
  <p>I really like this approach, but I've been all through the PHP docs, and my Google-fu is failing me here...</p>
  
  <p>I'd like to know if this  is officially supported by PHP (ie: is it undocumented and likely to be unsupported in the future?)</p>
  
  <p>I'd also like to know if there are any implications or "gotchas" with doing it this way instead of just importing the namespace and calling the function, or instantiating a class and calling a method.</p>