Apply a specific class/id to current page on menu (PHP)

Question

I have a menu like this:

Answer 1

You should:

1. check the result of strpos() with !== false.
2. Use $_SERVER['REQUEST_URI'] rather than $_SERVER['PHP_SELF'].
3. Wrap the code inside a function.

Something like this:

   href="http://domain.com/folder/biography">
   href="http://domain.com/folder/contacts">
  ...
  ...