title: how to add dynamic Active class on selected page
body: <p><a href="http://hotelshimlahill.com/demo/" rel="nofollow">http://hotelshimlahill.com/demo/</a>
  this website I've made in bootstrap,
  the header section including nav bar is coming from a separate file called 'header.php'
  Now i want to add active class for each page on which user is visiting.
  how can i do that? Kindly assist me.
  Thankyou.</p>