Description:
------------
On Windows, when a zero-length file is opened as a ZipArchive, the file is deleted when the zip is closed. This seems to happen in all releases of PHP. It does not seem to happen on Linux systems.

Test script:
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<?php
$filename = 'zerolengthfile.zip';
file_put_contents($filename, '');
assert(file_exists($filename));
$zip = new ZipArchive();
$zip->open($filename);
$zip->close();
assert(file_exists($filename));

Expected result:
----------------
I expect the assert at the end to not issue a message. I also expect zerolengthfile.zip to exist.

Actual result:
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Warning: assert(): assert(file_exists($filename)) failed in C:\phpexceltest\Owen
\testfile2.php on line 8

zerolengthfile.zip does not exist

If the $zip->close() statement is removed, the assert at the end does not issue a message. Nevertheless, zerolengthfile.zip does not exist when the script terminates.