title: When should I use parenthesis in require/include statements?
body: <p>I've been handed a pile of code that includes a lot of <code>require</code>/<code>include</code> statments (mixed between <code>require</code> and <code>require_once</code>).  Sometimes, the path has parenthesis around it, i.e. <code>require_once (JPATH_COMPONENT.DS.'controller.php');</code>, and other times there isn't: <code>require_once $path;</code>.</p>
  
  <p>The php docs for include <a href="http://www.php.net/manual/en/function.include.php" rel="noreferrer">mention this</a>, but aren't specific.  Should I remove the parenthesis when I find them, or is it ok to leave them alone?  When writing further require/include statements, are there specific cases where I should use them?</p>