Description:
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From manual page: http://www.php.net/ziparchive.open#refsect1-ziparchive.open-parameters
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From the current documentation:

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The mode to use to open the archive.

    ZIPARCHIVE::OVERWRITE

    ZIPARCHIVE::CREATE

    ZIPARCHIVE::EXCL

    ZIPARCHIVE::CHECKCONS
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This is a good start. However, these options need further documentation. It is unclear which option(s) to pick in various situations. The comments on the page provide some clarification but not enough, and it is clear that a number of people are struggling with it.

Test script:
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n/a