How can method exist when not defined or implemented explicitly?
<p>I thought maybe I was losing my mind, or just having a senior moment, when I about posted this question here.  But then I found the answer, which I've posted below, hopefully to help others who encounter this.</p>

<p>I'm using the FluentPDO library (<a href="https://github.com/lichtner/fluentpdo" rel="nofollow">https://github.com/lichtner/fluentpdo</a>).  I was pushing the limits of its capabilities and the documentation is a bit lacking.  So I began looking at the code.  I could not find the implementation of the SelectQuery::select() function, even though the documentation mentioned it, I was able to use it, and it's used internally.</p>

<p>How can a function or method exist, without a declaration or implementation?</p>
