title: Keep a check whether a value if selected from dropdown list using PHP
body: <p>I need to keep a check on whether a value is selected by the user from the dropdown box other than the default value which is at null position. If selected (any value other than default ) then I want to set a variable say $varSet = 1 and if not $varSet = 0, so depending on the $varSet value, I try to trigger the appropiate functions from my PHP script. </p>
  
  <p>Is it possible to achieve this using only PHP and HTML without any Javascript(client side)? Or is there any other possibilty to get this logic going?</p>