#47173 [Com]: $_SESSION reference inside function broken

[tommyhp2 at yahoo dot com]

 ID:               47173
 Comment by:       tommyhp2 at yahoo dot com
 Reported By:      tommyhp2 at yahoo dot com
 Status:           Open
 Bug Type:         Session related
 Operating System: Win03 R2 SP2 PHP ISAPI
 PHP Version:      5.2.8
 New Comment:

Same problem w/ CVS PHP 5.2 - Windows x86 VC6 (thread safe))  [10.02MB]
- 2009-Jan-20 12:00:00


Previous Comments:
------------------------------------------------------------------------

[2009-01-20 19:27:31] tommyhp2 at yahoo dot com

Description:
------------
use of variable variables broken when reference inside a function in
conjunction with $_SESSION.

Thanks,
Tommy

Reproduce code:
---------------
Scenario 1:
<code>
session_start();

$arr = array('idx1'=>'val1','idx2'=>'val2','idx3'=>'val3');

if (isset($_SESSION['arr']))
{
        $arr =& $_SESSION['arr'];
} else {
        $_SESSION =& $arr;
}
</code>
Works as intended (please see "Expected result").

Scenario 2:
<code>
function register_session($var)
{
        global $$var;

        if (isset($_SESSION[$var]))
        {
                $$var =& $_SESSION[$var];
        } else
        {
                $_SESSION[$var] =& $$var;
        }
}

session_start();

$arr = array('idx1'=>'val1','idx2'=>'val2','idx3'=>'val3');
register_session('arr');
</code>
Does not work as intended (Please see "Actual result").  The variable
$arr is not referenced.

Expected result:
----------------
["_SESSION"]=>
  &array(3) {
    ["idx1"]=>
    string(4) "val1"
    ["idx2"]=>
    string(4) "val2"
    ["idx3"]=>
    string(4) "val3"
  }
  ["arr"]=>
  &array(3) {
    ["idx1"]=>
    string(4) "val1"
    ["idx2"]=>
    string(4) "val2"
    ["idx3"]=>
    string(4) "val3"
  }

Actual result:
--------------
["_SESSION"]=>
  &array(1) {
    ["arr"]=>
    array(3) {
      ["idx1"]=>
      string(4) "val1"
      ["idx2"]=>
      string(4) "val2"
      ["idx3"]=>
      string(4) "val3"
    }
  }
  ["arr"]=>
  array(3) {
    ["idx1"]=>
    string(4) "val1"
    ["idx2"]=>
    string(4) "val2"
    ["idx3"]=>
    string(4) "val3"
  }


------------------------------------------------------------------------


-- 
Edit this bug report at http://bugs.php.net/?id=47173&edit=1