php - Paypal payment destroys Session on "Return" -

this question has been asked before. but, still unable find solution.

i have integrated paypal payment website. created , installed "payment button" (the html code), , works perfectly.

the problem, however, : after being re-directed paypal make payment, user's session on website destroyed. meaning : after payment successful (or canceled user, whichever).......the "return url" not work, because user has been logged out.

i did contact paypal, of course; and, expected, next useless (exactly many people here have attested to).

as said earlier, question has been asked before, here :

anybody ever used paypal website payments standard session variables?

the answer proposed "woppi" in thread seemed ok. but, when tried it, did not work. (of course, thread 3 years old).

i don't know else do.

i should point out following, (this makes no difference, want clear possible) :

(a) on website's "log-out page", have set sessions destroyed :

     session_unset();       unset($_session['login']);      unset($_session['password']);       session_destroy();       session_write_close();  

as far can see, there nothing wrong code. wipes out , destroys , sessions (which should case, shouldn't it? otherwise, point of logging out? )

(b) not have "cookies" set anywhere (which may part of problem, although not sure). however, have these in html header :

    <meta http-equiv="cache-control" content="no-cache">     <meta http-equiv="pragma" content="no-cache">     <meta http-equiv="expires" content="0"> 

(c) in old thread (given above), requires value : $session_id;

at beginning of every php page in website, have :

   **<?php session_start();** 

this has worked far me; did not assign specific id anywhere else.

update

i using cookies in php try resolve problem;

at top of php payment form, have :

  <?php session_start();    if (!(isset($_session['login'])) {    header ("location: /example/access_denied");    exit() ;   }         $cookie_name = "user_paying";   $cookie_value = $_session['login'];   $date_of_expiry = time() + 600 ;    setcookie($cookie_name, $cookie_value, $date_of_expiry, '/', false,true);      

(i set cookies expire after 10 minutes);

then, in "return-form" (where user re-directed after making payment in paypal), have @ top :

 <?php session_start();   if (!isset($_cookie['user_paying'])) {  setcookie($cookie_name, $cookie_value, $date_of_expiry, '/', false,true);   }   else {   // etc, etc, etc..........code continues