title: Call controller within another controller - CodeIgniter
body: <p>I need to call a controller say 'faq_view' inside admin controller as the URL structure admin/faq_view like this how I can do this?</p>
  
  <p>e.g: </p>
  
  <p>site.com/maincontroller/function</p>
  
  <p>site.com/maincontroller/othercontroller/function</p>