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There is an issue with the ZipArchive class' open() method. In previous versions of PHP when the only flag passed to the method was the ZipArchive::OVERWRITE, the method also created non-existing archives.

Since PHP 5.6 the OVERWRITE flag alone cannot create new archives which breaks compatibility.

Test script:

// Open new archive in cwd based on timestamp

$zip = new ZipArchive();

$open = $zip->open(time() . '.zip', ZipArchive::OVERWRITE);

echo $open;

Expected result:

Expected behavior: The new archive is opened as in the previous version.

Actual result:

In PHP 5.5 an empty archive is opened.

In PHP 5.6 ZipArchive::ER_OPEN error code is returned (cannot open zip file).