[wp-trac] [WordPress Trac] #29684: Add get_main_site() function

[WordPress Trac]

#29684: Add get_main_site() function
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 Reporter:  rmccue              |      Owner:
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:  3.9
 Severity:  normal              |   Keywords:
  Focuses:  multisite           |
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 At the moment, the code that works out the main site for a network is
 locked away in `ms-settings.php`. We should move this out into a function
 that `ms-settings.php` can then use (ala `get_site_by_path` logic).

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Ticket URL: <https://core.trac.wordpress.org/ticket/29684>
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