drupal 6 - A link for previous page in current page -

I was trying to display a link in a page that the user would give to the previous page in the drop. First I was using the session

  $ _SESSION ['back'] $ _SESSION ['back'] = htmlentities ($ _ server ['REQUEST_URI']);  

It worked fine, but I was asked to use variable_gate and set in Doppla and was not used to use sessions, so I did this

  global $ prev_global; $ Prev_global = variable_get ($ prev_page, $ default = 'http: //mysite.local'); Variable_set ($ prev_page, htmlentities ($ _ server ['REQUEST_URI'])); . . . Echo "PREV:". $ Prev_global;  

But it always points to the current page, what went wrong here?

I do not know that you have variable_get () and variable_set () , but do not forget to hear them again. And work on the global variable, not a user-based variable

You corrected it for the first time. Use the $ _ session : That's what it does for you.