Description:
------------
Package version: 0.3.1

Calling rar_list() via another function causes the resource handle to become invalid.

Reproduce code:
---------------
function do_rar($ra)
{
  $entries = rar_list($ra);
}

$filename = "tmp/amin.rar";
$ra = rar_open($filename);
$entries = rar_list($ra);
do_rar($ra);
rar_close($ra);

Expected result:
----------------
I expect no errors to occur.

Actual result:
--------------
Upon calling rar_close() I get the warning "cannot find Rar file resource". If I comment out the line where I call do_rar(), however, the error disappears. 

It looks as if calling rar_list() indirectly via do_rar() causes the resource handle to become invalid, while calling rar_list() directly leaves the handle intact.