[wp-trac] [WordPress Trac] #38176: Add 'default' to register_setting

[WordPress Trac]

#38176: Add 'default' to register_setting
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 Reporter:  rmccue              |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Options, Meta APIs  |    Version:
 Severity:  normal              |   Keywords:  has-patch
  Focuses:                      |
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 Imagine a future where you don't need to pass your default settings every
 time you call `get_option`. Instead, you simply pass into
 `register_setting` once.

 Attached patch does this. Also moves the `register_setting` group of
 functions from `wp-admin` to `wp-includes/option.php` to allow usage
 everywhere, rather than just in the admin. This is probably a Good Idea
 with the changes made in #37885, as `register_setting` is now also useful
 for the REST API, not just the admin.

 This ''does'' do some funky meta-programming that sucks a bit: if you call
 `get_option( 'option_name' )` without a default parameter, it uses the
 registered default. If you call `get_option( 'option_name', false )`, it
 uses the value you passed in (`false`) '''even though''' this is the
 default parameter value. This isn't great, but allows us to do this nicely
 with backwards compatibility and is somewhat less surprising.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38176>
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