title: What is the good example of using 'func_get_arg' in PHP?
body: <p>I just have found out that there is a function called <code>func_get_arg</code> in PHP which enables developer to use variant style of getting arguments. 
  It seems to be very useful because number of argument can now be arbitrary, but I cannot think of any good example of using it.</p>
  
  <p>What are the some examples of using this function to fully benefit its polymorphic characteristic?</p>