Description:
------------
If closing a ZipArchive fails for whatever reason, no error
indication is given (ZipArchive::close() returns TRUE), and it is
not possible to get further information by calling
ZipArchive::getStatusString(), because the internal zip_t has
already been closed.


Test script:
---------------
<?php
$zip = new ZipArchive();
var_dump($zip->open('./test.zip', ZipArchive::CREATE | ZipArchive::OVERWRITE));
var_dump($zip->close());
?>


Expected result:
----------------
bool(true)
bool(false)


Actual result:
--------------
bool(true)
bool(true)