title: PHP Catch "Empty" Includes
body: <p>We have a custom framework that we use, that allows us to <code>include</code> code in to other pages.  However, the header for this code is always printed, even if the <code>include</code> code doesn't output anything.  Is there a way that I can <code>exit</code>, or <code>return</code> something specific, that I can trap and catch via <code>include</code>/<code>require</code>, so that I can do the right thing?</p>