[wp-trac] [WordPress Trac] #38401: PHP warning by WP_REST_Posts_Controller::prepare_items_query(): array_flip() can only flip string and integer values

[WordPress Trac]

#38401: PHP warning by WP_REST_Posts_Controller::prepare_items_query():
array_flip() can only flip string and integer values
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 Reporter:  ocean90       |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.7
Component:  REST API      |     Version:  trunk
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by flixos90):

 Isn't that incorrect usage of the filter there (in the Handbook plugin)? I
 thought you should only add names of public query vars using the
 `query_vars` filter.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38401#comment:1>
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