Under certain circumstances, it can be necessary that a user should not be added to a site, beyond the restrictions that WordPress core applies. With the new `can_add_user_to_blog` filter, plugin developers can run custom checks and return an error in case of a failure, that will prevent the user from being added.
The user-facing parts and the REST API route that interact with `add_user_to_blog()` have been adjusted accordingly to provide appropriate error feedback when a user could not be added to a site. Furthermore, two existing error feedback messages in the site admin's "New User" screen have been adjusted to properly show inside an error notice instead of a success notice.
Props jmdodd.
Fixes#41101.
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This reduces the chances of a site compromise going unnoticed, in the same way that the same notifications for user account email address changes reduces the chances of a user account compromise going unnoticed.
Props MatheusGimenez, johnbillion
Fixes#39117
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Before this changeset, the language of a new site would always result in the language of the current network, regardless of the `$site_id` parameter passed that actually determines the network for the site. Now the correct `WPLANG` value is used in such cases.
Alongside this change, a few minor documentation changes around the function have been made to account for the current naming conventions of sites and networks.
Props spacedmonkey.
Fixes#40503.
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Prior to this change, after creating a site, the network site count was always refreshed on the current network, regardless of whether the site was created on a different network. With the recent changes, particularly [40591], it is now possible to update the site count for a specific `$network_id`, so this changeset makes use of the new parameter.
Fixes#38699.
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If an email address is missing an `@`, we can't assume enough to check it against a list of domain names.
Additional validation of email should happen in `is_email()` before being passed to `is_email_address_unsafe()`.
Fixes#39915.
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Now that `get_blog_count()` and `get_user_count()` both support passing a `$network_id` parameter (see [40370] and [40371]), similar functionality is now available for `wp_is_large_network()`. In addition, the filter `wp_is_large_network` now accepts the network ID as its fourth parameter.
This changeset furthermore introduces unit tests for the `wp_is_large_network()` function and its filter.
Fixes#40489.
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Prior to this change, the minimum site name length checked in `wpmu_validate_blog_signup()` was set to a fixed value of 4. The new filter allows tweaking this value, as there may be cases where shorter site names may be required.
Fixes#39676.
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Using the new parameter, it is now possible to update the user count on a network different from the current one. While the count itself is technically a global user count and not network-wide, it is stored on each individual network, and the new parameter provides more control about where to update the count.
Fixes#40349. See #38699.
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[40295] removed the restriction of a minimum amount of characters for new site names, which could cause unexpected behavior. That changeset is reverted here with the exception of the removal of the `is_super_admin()` check, which can safely be omitted. A new filter for the minimum site name length will be introduced later to be able to modify that behavior.
See #39676, #37616.
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The `get_user_count()` function returns the number of active users on a network, which is stored in a `user_count` network option. Since `get_network_option()` supports retrieving options from other networks than the current one, `get_user_count()` can now make use of that feature.
Fixes#37866.
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The `get_blog_count()` function used to support an `$id` parameter for the network ID prior to WordPress 3.1. This parameter has not been used since the introduction of `get_site_option()` and was later deprecated in [25113]. With `get_network_option()` however it is possible to support the parameter again, now properly renamed as `$network_id`.
A unit test has for the parameter has been added as well. Another unit test in the same class was adjusted to work properly with multiple networks existing.
Fixes#37865.
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It is sometimes desirable to support shorter site names than 4 characters, therefore that restriction should be removed. It is still possible to manually enforce it by using the `wpmu_validate_blog_signup` filter.
As a result of this change, another `is_super_admin()` call gets removed which affects the ongoing efforts of working on a network-wide role system.
Props milindmore22.
Fixes#39676. See #37616.
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With the introduction of user-specific languages in [38705] it's necessary to be able to switch translations on the fly. For example emails should be sent in the language of the recipient and not the one of the current user.
This introduces a new `WP_Locale_Switcher` class which is used for switching locales and translations. It holds the stack of locales whenever `switch_to_locale( $locale )` is called. With `restore_previous_locale()` you can restore the previous locale. `restore_current_locale()` empties the stack and sets the locale back to the initial value.
`switch_to_locale()` is added to most of core's email functions, either with the value of `get_locale()` (site language) or `get_user_locale()` (user language with fallback to site language).
Props yoavf, tfrommen, swissspidy, pbearne, ocean90.
See #29783.
Fixes#26511.
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`get_network()` falls back to the current network when called without any arguments. Between this and `get_current_network_id()`, we can replace almost all instances of the global `$current_site` and all instances of `get_current_site()`.
This effectively deprecates `get_current_site()`, something that we'll do in a future ticket.
Props flixos90.
Fixes#37414.
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`get_sites()` should be considered a replacement for `wp_get_sites()`. Backward compatibility is maintained in the meantime by using `get_site()` to populate the return data with associative arrays rather than `WP_Site` objects.
Props spacedmonkey, flixos90.
See #35791.
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Felix Arntz
Drew Jaynes
John Blackbourn
Jeremy Felt
Sergey Biryukov
Dominik Schilling
Scott Taylor
Pascal Birchler