PHP : get Request protocol Http or HTTPS

1. <?php
2.  
3. if ($_SERVER['HTTPS'] != "on") {
4. echo "This is not HTTPS";
5. }else{
6. echo "This is HTTPS";
7. }
8.  
9. <?

http://snipplr.com/view/62373/check-if-url-is-https-in-php/