[wp-trac] [WordPress Trac] #45749: Add short circuits for multisite classes.

[WordPress Trac]

#45749: Add short circuits for multisite classes.
--------------------------------+------------------------------
 Reporter:  spacedmonkey        |       Owner:  adamsilverstein
     Type:  enhancement         |      Status:  assigned
 Priority:  normal              |   Milestone:  5.2
Component:  Networks and Sites  |     Version:  4.6
 Severity:  normal              |  Resolution:
 Keywords:  has-patch commit    |     Focuses:  multisite
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Comment (by adamsilverstein):

 @spacedmonkey Thanks! Running tests on [attachment:"45749.5.diff"], code
 looks good.

 Does this look good for the commit message?


  Multisite: add a `sites_pre_query` filter to short circuit WP_Site_Query
 queries.
  Add a new filter `sites_pre_query` - which returns null by default.
 Return a non-null value to bypass WordPress's default `get_sites` queries.
 Similar to the `posts_pre_query` filter for WP_Query added in #36687. This
 filter lets you short circuit the WP_Site_Query query to return your own
 results.
  Developers should note that filtering functions that require pagination
 information are encouraged to set the `found_sites` property of the
 WP_Site_Query object, passed to the filter by reference. If WP_Site_Query
 does not perform a database query, it will not have enough information to
 generate these values itself.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45749#comment:18>
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