Description:
------------
In my script, a user-defined class is instantiated, and a reference is maintained until the script's end.  When the script ends, the class's __destruct() method is called.  Inside of the __destruct() method for this class, I was trying to open a file on the server to save data.

Reproduce code:
---------------
<?php
class Foo
{
    function __destruct()
    {
        $out = fopen("save.txt", "w");
        fwrite($out, $info);
    }
}

$temp = new Foo();
?>

Expected result:
----------------
I expected that, when the script ended, the __destruct() method would be called, and it would successfully open the file and save the data.

Actual result:
--------------
When opening a file for writing, I would get a warning, "failed to open stream: Permission denied"; if I tried to open a file for reading, I would get a different warning, "failed to open stream: No such file or directory".

Neither of these errors are appropriate: all permissions were available, the file was already created.  If I used the exact same code in another method, or destroyed the reference to the class before the script's termination (thus causing the __destruct() method to be called earlier), the file would open and write with no problems.  This only arose when the reference to my object was destroyed by the script's termination.