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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Previously, an value matching `empty()` would have been bypassed in favor of the default setting for 100MB.
Related #19538, r19639, r19652, where we saw the bug, fixed the bug, and then unfixed the bug so that it was not a surprise in a point release.
See #34037.
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The `_network_option()` parameter order will be changing to accept `$network_id` first. The `_site_option()` functions will remain in use throughout core as our way of retrieving a network option for the current network.
See #28290.
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The `WP_INSTALLING` constant is a flag that WordPress sets in a number of
places, telling the system that options should be fetched directly from the
database instead of from the cache, that WP should not ping wordpress.org for
updates, that the normal "not installed" checks should be bypassed, and so on.
A constant is generally necessary for this purpose, because the flag is
typically set before the WP bootstrap, meaning that WP functions are not yet
available. However, it is possible - notably, during `wpmu_create_blog()` -
for the "installing" flag to be set after WP has already loaded. In these
cases, `WP_INSTALLING` would be set for the remainder of the process, since
there's no way to change a constant once it's defined. This, in turn, polluted
later function calls that ought to have been outside the scope of site
creation, particularly the non-caching of option data. The problem was
particularly evident in the case of the automated tests, where `WP_INSTALLING`
was set the first time a site was created, and remained set for the rest of the
suite.
The new `wp_installing()` function allows developers to fetch the current
installation status (when called without any arguments) or to set the
installation status (when called with a boolean `true` or `false`). Use of
the `WP_INSTALLING` constant is still supported; `wp_installing()` will default
to `true` if the constant is defined during the bootstrap.
Props boonebgorges, jeremyfelt.
See #31130.
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