Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs.
See #41452.
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Historically, it's been difficult to extend user roles, but reasonable to work around by waiting until after `init` has fired, to add custom roles and capabilities. With the addition of Locale Switching, Core now potentially loads roles before `init` has fired, leaving a window where custom roles and capabilities are not handled.
The new filter allows plugins to add their own custom roles whenever they're initialised (on page load, or when switching sites, for example), so that they can always be obeyed.
`WP_Roles` has also been tidied up a little bit, to remove duplicate code.
Props johnjamesjacoby, pento.
Fixes#23016.
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Also use 'back-compat' in some inline comments where backward compatibility is the subject and shorthand feels more natural.
Note: 'backwards compatibility/compatibile' can also be considered correct, though it's primary seen in regular use in British English.
Props ocean90.
Fixes#36835.
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Multisite functions use the term "blog" to refer to what we now call a "site," e.g. `get_current_blog_id()`. These functions are here to stay because of our commitment to backwards compatibility. What we can do is set the documentation straight.
See #35417.
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Creates:
`class-wp-roles.php`
`class-wp-role.php`
`class-wp-user.php`
`capbilities-functions.php`
`capbilities.php` contains only top-level code. Class files only contains classes. Functions file only contains functions.
See #33413.
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