[wp-trac] [WordPress Trac] #38175: Use `get_sites()` instead of a database lookup in `get_id_from_blogname()`

[WordPress Trac]

#38175: Use `get_sites()` instead of a database lookup in `get_id_from_blogname()`
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 Reporter:  jeremyfelt          |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  4.7
Component:  Networks and Sites  |    Version:
 Severity:  normal              |   Keywords:
  Focuses:  multisite           |
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 This was originally introduced in a patch on #34450, but deserved its own
 ticket due to the scope of changes.

 Now that `get_sites()` is available (4.6.0) and via `WP_Site_Query`
 (4.6.0) caches queries, we can use this to handle the slug lookup instead
 of the manual database query.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38175>
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