PHP : getting images from DB

i am given a task to edit some existing MVC PHP site in interview but i really cant get this piece of code , can someone please help me with the code what does it actually mean . I mean this code is getting values for some specific member in database and there is no query that shows how is this specific member selected

<div class="cover">
  <img src="<?php echo $member_featured->logo; ?>" width="250" height="250">
</div>

at the moment its displaying an image for some specific company and i need to change it to another one , Will some one please explain what is this $member_featured->logo; i mean how do i trace query that's working on back-end