title: Moodle how to find out the role of the logged in user
body: <p>How to get context/role of logged in user in moodle?
  I am trying to implement a context-aware block. The block would suggest the right quizzes to its users based on their moods. </p>
  
  <p>Role can be a teacher, student, teacher assistant or admin. I have already found the <code>get_context_instance()</code> &amp; <code>has_compatibility()</code> functions, but I don't know how to use them for this purpose.</p>