Description:
------------
Could not get expected value, when call $_REQUEST["foo"] in a user-built function included from another file. (Still works fine if the function is in the same file)

Reproduce code:
---------------
* function.php:
    <?
      function getNumber($var) {
        return intval($var);
      }
    ?>
* index.php:
    <?
      include("function.php");
      echo getNumber($_REQUEST["foo"]) . "<BR>";
      echo getNumber($_GET["foo"]) . "<BR>";
    ?>

Calling http://test.server/index.php?foo=2 from browser, problem would happened with the second and later request to that URL.

Expected result:
----------------
2
2

Actual result:
--------------
First request:
2
2

Second and later request:
0
2