I would like to be able to get all registered custom fields or post meta for a given post.

The limitation I am facing is that the use of either get_post_meta or get_post_custom returns an array of the fields that are not empty. Empty fields are ignored.

Is there a workaround for getting all the fields registered by a theme or by a plugin even if they are empty? I understand that this is probably impossible since empty fields do not have any records in the database, but I would very much appreciate a confirmation before I abandon this altogether..

Thanks a lot, Harry

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