Displaying page specific content [on hold]

I am making a website with PHP and have encountered an issue.

• All my webpages include a footer, and I want to display data in the footer depending on the opened webpage, I found a very non-robust way of doing this.

  if( $CU == 'http://www.example.com' 
       || $CU == 'http://example/index.php'     
       || $CU == 'http://example/index.php/'    
       || $CU == 'http://example/')
  { 
  $display = "<p>Already registered? <a href='login.php'>Sign in</a></p>";
  }
  
  elseif( $CU == 'http://ift.tt/1IGJxDG' 
       || $CU == 'http://ift.tt/1mNFg9X' )
   { 
   $display = "<p>Forgotten your password? <a href='reset_password.php'>Reset</a> your password!</p>";
   }
  
  

Question (edited): What is a robust method of dynamically loading content based on the current file?

via Chebli Mohamed