Referral URL in php

Question

So I am trying to get the page where a visitor came from. I inserted this code into a php file and I am trying to see the page's URL but it is not working, any suggestions?

<?php 

  $ref = getenv("HTTP_REFERER"); 
  echo $ref; 

?>

(added this after some answers) I have also tried

print $_SERVER["HTTP_REFERER"];

and that doesn't work either

it worked after i updated the website many times, not sure why was there a problem in the first place, thanks anyway :)

Answer 1

Have you tried accessing through the $_SERVER superglobal?

print $_SERVER["HTTP_REFERER"];