title: what does $this mean within a class definition?
body: <p>As I continue to try and improve myself as a junior PHP developer, I have started to try break down other peoples work. I find it helps me understand, as well as giving me ideas.</p>
  
  <p>Two things I do not get, in a PHP class, what $this means, and what array($this,'some_function') means when I would expect a function name in it's place.</p>
  
  <p>Many thanks</p>