[wp-trac] [WordPress Trac] #28099: Empty array passed to WP_Query post__in returns posts

[WordPress Trac]

#28099: Empty array passed to WP_Query post__in returns posts
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 Reporter:  danielbachhuber  |       Owner:  wonderboymusic
     Type:  defect (bug)     |      Status:  reopened
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Query            |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  has-patch        |     Focuses:
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Comment (by pikamander2):

 If there's any way to rip off the band-aid and make passing 0 actually
 return 0 posts, I think that would be the best way forward.

 I haven't looked at the underlying code so I might be getting the details
 wrong here but I would think that a way forward to a more sane behavior
 would be to:

 1. Temporarily throw a deprecation warning in an upcoming release when 0
 is passed, instructing the developer to instead use null or -1 or no
 parameter if they want posts to be displayed or [0] if they don't and
 informing them that a future release will change the behavior.

 2. In a release sometime after that, remove the deprecation warning and
 make 0 actually return 0 posts.

 That approach would still cause some friction but would make for a far
 better default behavior and would allow actively maintained plugins/themes
 to update their code.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28099#comment:39>
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