Commit Graph

121 Commits

Author SHA1 Message Date
Jonathan Desrosiers
7a6ba32941 Networks and Sites: Officially remove global terms.
Global terms was a feature from the WordPress MU days where multisite and single site installs used different code bases.

In WordPress 3.0, WordPress MU was merged into one location and the UI [14854] and “on” switch [14880] for global terms were completely removed.

Even before this merge, global terms was bug infested and unreliable. After [14854]/[14880], the feature was no longer maintained and became increasingly broken as taxonomies progressed without it (term splitting and term meta do not work at all). At this point, the feature has not worked in 12+ years and there’s no hope for saving it.

This deprecates the remaining global terms related code and no-ops the functions.

Global terms, you don’t have to go home, but you can’t stay here.

Props scribu, wonderboymusic, SergeyBiryukov, nacin, pento, desrosj, johnjamesjacoby, johnbillion, dd32.
Fixes #21734.

git-svn-id: https://develop.svn.wordpress.org/trunk@54240 602fd350-edb4-49c9-b593-d223f7449a82
2022-09-20 02:49:25 +00:00
Sergey Biryukov
09e619c648 Date/Time: Correct sanitization of localized default timezone_string in populate_options().
This fixes a bug where if the default `timezone_string` is set to a deprecated timezone name due to a localization providing an outdated timezone name string, this localized timezone string would be discarded and an empty string would be set as the timezone value instead.

By passing the `DateTimeZone::ALL_WITH_BC` constant as the `$timezoneGroup` parameter to the PHP native `timezone_identifiers_list()` function, a timezone name list is retrieved containing both current and deprecated timezone names, preventing the invalidation of the option value.

See the extensive write-up about this in ticket #56468.

Also see: [https://www.php.net/manual/en/datetimezone.listidentifiers.php PHP Manual: timezone_identifiers_list()].

Includes:
* Expanding the translators comment to encourage translators to use “old” names over “new” names.
* Adding a dedicated test to the `Tests_Admin_IncludesSchema` test class.

Follow-up to [54207], [54217], [54227], [54229], [54230].

Props jrf, costdev.
See #56468.

git-svn-id: https://develop.svn.wordpress.org/trunk@54232 602fd350-edb4-49c9-b593-d223f7449a82
2022-09-20 00:41:58 +00:00
Jb Audras
66dba67484 Administration: Change default site tagline to an empty string.
This changeset replaces the default "Just another WordPress site" tagline with an empty string for new installations. The reasoning is:

1. Not all themes display the tagline;
2. Not everyone changes the default tagline;
3. When people don't see the tagline in their theme, they may not realize it is still visible in some places, like feeds.

The string "Just another WordPress site" and the related multisite string: "Just another {NETWORK} site" are now only used as a placeholder for the tagline admin option.

Props markjaquith, Denis-de-Bernardy, westi, RyanMurphy, kovshenin, SergeyBiryukov, chriscct7, tyxla, hyperbrand, karmatosed, lukecavanagh, melchoyce, boemedia, khag7, sabernhardt, audrasjb, peterwilsoncc, costdev, martinkrcho, rafiahmedd.
Fixes #6479.


git-svn-id: https://develop.svn.wordpress.org/trunk@53815 602fd350-edb4-49c9-b593-d223f7449a82
2022-08-03 12:18:22 +00:00
Peter Wilson
b72c1d00ae Networks and Sites: Remove duplicate cache entry.
Remove the `networks_have_paths, site-options` cache entry as it duplicates caching within the `WP_Network_Query` class.

Props uday17035, spacedmonkey, johnbillion, johnjamesjacoby.
Fixes #42070.



git-svn-id: https://develop.svn.wordpress.org/trunk@53083 602fd350-edb4-49c9-b593-d223f7449a82
2022-04-06 04:33:50 +00:00
Jonny Harris
e19b7ead2c Users: Introduce the concept of a large site to single site installations.
Currently in WordPress multisite there is a concept of large networks. The function `wp_is_large_network` is used to determine if a network has a large number of sites or users. If a network is marked as large, then 
expensive queries to calculate user counts are not run on page load but deferred to scheduled events. However there are a number of places in a single site installation where this functionality would also be useful, as 
expensive calls to count users and roles can make screens in the admin extremely slow.

In this change, the `get_user_count` function and related functionality around it is ported to be available in a single site context. This means that expensive calls to the `count_users` function are replaced with 
calls to `get_user_count`. This change also includes a new function called `wp_is_large_user_count` and a filter of the same name, to mark if a site is large.

Props johnbillion, Spacedmonkey, Mista-Flo, lumpysimon, tharsheblows, obenland, miss_jwo, jrchamp, flixos90, macbookandrew, pento, desrosj, johnjamesjacoby, jb510, davidbaumwald, costdev. 
Fixes #38741.



git-svn-id: https://develop.svn.wordpress.org/trunk@53011 602fd350-edb4-49c9-b593-d223f7449a82
2022-03-29 12:41:00 +00:00
Jonathan Desrosiers
d87196b560 Docs: Remove instances of the “eg.” abbreviation in favor of “example” or “for example”.
See #53330.

git-svn-id: https://develop.svn.wordpress.org/trunk@52215 602fd350-edb4-49c9-b593-d223f7449a82
2021-11-19 14:42:04 +00:00
Tonya Mork
ab0e915f40 Coding Standards: Remove redundant ignore annotation in populate_options().
Follow-up to [43627], [43628].

Props jrf, hellofromTonya.
See #53359.

git-svn-id: https://develop.svn.wordpress.org/trunk@51660 602fd350-edb4-49c9-b593-d223f7449a82
2021-08-26 13:49:30 +00:00
Peter Wilson
2a02de7d53 Upgrade/Install: Notify users of deactivated plugins during upgrade.
This adds a one-off notice to the dashboard in the event WordPress has automatically deactivated a plugin due to incompatibility with the new version of WordPress.

Introduces the new private function `deactivated_plugins_notice()` to display the notice in the dashboard. Introduces the new auto-loaded option `wp_force_deactivated_plugins` to store a list of automatically deactivated plugins; the option is used on both a site and network level.

Follow up to [51180].

Props desrosj, jorbin, azaozz, SergeyBiryukov, peterwilsoncc.
See #53432.



git-svn-id: https://develop.svn.wordpress.org/trunk@51266 602fd350-edb4-49c9-b593-d223f7449a82
2021-06-30 00:20:52 +00:00
Adam Silverstein
6a5ff5aa03 Images: enable WebP support.
Add support for uploading, editing and saving WebP images when supported by the server.

Add 'image/webp' to supported mime types. Correctly identify WebP images and sizes even when PHP doesn't support WebP. Resize uploaded WebP files (when supported) and use for front end markup.

Props markoheijne, blobfolio, Clorith, joemcgill, atjn, desrosj, spacedmonkey, marylauc, mikeschroder, hellofromtonya, flixos90.
Fixes #35725.



git-svn-id: https://develop.svn.wordpress.org/trunk@50810 602fd350-edb4-49c9-b593-d223f7449a82
2021-05-04 14:43:36 +00:00
Helen Hou-Sandi
f517634e28 Upgrade/Install: Enable all core autoupdates for new installs.
Likely needs more work for multisite installs.

Reference: https://make.wordpress.org/core/2020/11/10/wp5-6-auto-update-implementation-change/

Props audrasjb, azaozz.
See #51743.


git-svn-id: https://develop.svn.wordpress.org/trunk@49581 602fd350-edb4-49c9-b593-d223f7449a82
2020-11-12 20:19:46 +00:00
Sergey Biryukov
7d23a212c4 Docs: Update the URL for PHP date formats table in translator comments.
Props hareesh-pillai, iandunn.
Fixes #51332.

git-svn-id: https://develop.svn.wordpress.org/trunk@48991 602fd350-edb4-49c9-b593-d223f7449a82
2020-09-18 10:35:41 +00:00
John Blackbourn
285fa03b3a Docs: First pass at some inline docs fixes mostly made by PHPCBF.
See #49572, #50744

git-svn-id: https://develop.svn.wordpress.org/trunk@48586 602fd350-edb4-49c9-b593-d223f7449a82
2020-07-23 19:59:16 +00:00
Aaron Jorbin
cefe2c7f7c General: Update code for readability and inclusion
There are two pieces in here:

1) The update to change blacklist to blocklist is moved to disallowed_list. "Block" has a meaning in our code, and there could be ambiguity between this code and code related to blocks.

2) This improves backwards compatibility for code that was accessing the now deprecated code.

Previously: [48477], [48405], [48400], [48121], [48122], [48124], [48142], [48566]

Props: desrosj, SergeyBiryukov, johnjamesjacoby
Fixes: #50413



git-svn-id: https://develop.svn.wordpress.org/trunk@48575 602fd350-edb4-49c9-b593-d223f7449a82
2020-07-23 03:12:49 +00:00
Jonathan Desrosiers
bfb896ce08 Administration: Prevent repeat emails for identical plugin or theme auto-update attempt failures.
This change adds a throttle mechanism to plugin and theme auto-update failure emails using similar logic to the email sent for a Core auto-update.

The first time a plugin or theme auto-update fails, the package and `new_version` will be tracked in the `auto_plugin_theme_update_emails` option. An email for this specific update attempt will not be resent.

However, if this update fails again and non-repeat failures or successful updates are also present, then the failure information will be included in that email (an email needs to be sent for the new events regardless).

Props johnbillion, arpitgshah, desrosj, audrasjb, pbiron, earnjam.
Fixes #50448.

git-svn-id: https://develop.svn.wordpress.org/trunk@48397 602fd350-edb4-49c9-b593-d223f7449a82
2020-07-07 18:58:32 +00:00
Jonathan Desrosiers
e26394bb2d General: Remove “whitelist” and “blacklist” in favor of more clear and inclusive language.
“The WordPress open source community cares about diversity. We strive to maintain a welcoming environment where everyone can feel included.”

With this commit, all occurrences of “whitelist” and “blacklist” (with the single exception of the `$new_whitelist_options` global variable) are removed. A new ticket has been opened to explore renaming the `$new_whitelist_options` variable (#50434).

Changing to more specific names or rewording sentences containing these terms not only makes the code more inclusive, but also helps provide clarity. These terms are often ambiguous. What is being blocked or allowed is not always immediately clear. This can make it more difficult for non-native English speakers to read through the codebase.

Words matter. If one contributor feels more welcome because these terms are removed, this was worth the effort.

Props strangerstudios, jorbin, desrosj, joemcgill, timothyblynjacobs, ocean90, ayeshrajans, davidbaumwald, earnjam.
See #48900, #50434.
Fixes #50413.

git-svn-id: https://develop.svn.wordpress.org/trunk@48121 602fd350-edb4-49c9-b593-d223f7449a82
2020-06-22 17:24:34 +00:00
Sergey Biryukov
6742d0d7a6 Coding Standards: Use strict comparison where static strings are involved.
This reduces the number of `WordPress.PHP.StrictComparisons.LooseComparison` issues in half, from 1897 to 890.

Includes minor code layout fixes for better readability.

See #49542.

git-svn-id: https://develop.svn.wordpress.org/trunk@47808 602fd350-edb4-49c9-b593-d223f7449a82
2020-05-16 18:40:52 +00:00
Sergey Biryukov
892e013bbf Docs: Use 3-digit, x.x.x style semantic versioning for inline comments in populate_options().
See #49572.

git-svn-id: https://develop.svn.wordpress.org/trunk@47782 602fd350-edb4-49c9-b593-d223f7449a82
2020-05-11 17:24:24 +00:00
Jonathan Desrosiers
8e2de8212b General: Fix various issues flagged by the PHPCompatibilityWP PHPCS ruleset.
As part of the continued effort to improve PHP compatibility, the following improvments are being made:

- Removing deprecated PHP `safe_mode` checks not found in bundled external libraries.
- Change the remaining `while` loops using `each()` to `foreach` loops.
- Prevent false positives from being flagged for the `sodium_compat` library being caused by loading this in a non-standard way.
- Add inline comments to not flag deprecated PHP directives in the getID3 library.

Props desrosj, earnjam, dryanpress.
See #49922.

git-svn-id: https://develop.svn.wordpress.org/trunk@47735 602fd350-edb4-49c9-b593-d223f7449a82
2020-05-01 19:05:04 +00:00
Sergey Biryukov
d5a7a3a45d Comments: Use comment instead of an empty string for the comment_type DB field value in comments table.
This is the first step to bring support for custom comment types into WordPress.

Add a scheduled upgrade routine to update the type value for existing comments, in batches of 100 at a time.

Props imath, aaroncampbell, jeremyfelt, dshanske.
Fixes #49236.

git-svn-id: https://develop.svn.wordpress.org/trunk@47597 602fd350-edb4-49c9-b593-d223f7449a82
2020-04-17 19:33:52 +00:00
Sergey Biryukov
0b4e2c4604 Coding Standards: Use strict type check for in_array() and array_search() where strings are involved.
This reduces the number of `WordPress.PHP.StrictInArray.MissingTrueStrict` issues from 486 to 50.

Includes minor code layout fixes for better readability.

See #49542.

git-svn-id: https://develop.svn.wordpress.org/trunk@47550 602fd350-edb4-49c9-b593-d223f7449a82
2020-04-05 03:00:44 +00:00
Sergey Biryukov
f97a60c9b7 Privacy: Revert [47269] for now to address side effects on Multisite installations.
See #44176.

git-svn-id: https://develop.svn.wordpress.org/trunk@47280 602fd350-edb4-49c9-b593-d223f7449a82
2020-02-11 21:46:54 +00:00
Sergey Biryukov
0911aecf36 Privacy: Un-map privacy capabilities to make them available to be assigned for custom roles:
* `erase_others_personal_data`
* `export_others_personal_data`
* `manage_privacy_options`

Previously mapped to `manage_options` or `manage_network` (on Multisite), these are now added to the Administrator role separately.

Additionally, `manage_privacy_options` is added to the Editor role.

Props garrett-eclipse, xkon, pbiron, desrosj, johnbillion, flixos90, juliobox, lakenh, Ov3rfly, ianatkins.
Fixes #44176.

git-svn-id: https://develop.svn.wordpress.org/trunk@47269 602fd350-edb4-49c9-b593-d223f7449a82
2020-02-11 18:34:08 +00:00
Sergey Biryukov
cfc3b57488 Docs: Improve inline comments per the documentation standards.
Includes minor code layout fixes for better readability.

See #48303.

git-svn-id: https://develop.svn.wordpress.org/trunk@47122 602fd350-edb4-49c9-b593-d223f7449a82
2020-01-29 00:43:23 +00:00
Sergey Biryukov
a8f4ed69de Docs: Update links to https://secure.php.net/, they now redirect to https://www.php.net/.
See #48303.

git-svn-id: https://develop.svn.wordpress.org/trunk@47088 602fd350-edb4-49c9-b593-d223f7449a82
2020-01-20 03:12:12 +00:00
Jake Spurlock
a63e490a1e Multisite: Remove the redundant blog_versions table.
As part of the Multisite installation process, a `blog_versions` table is created. This table is never read from (except immediately prior to updating it), it's only ever inserted into or updated. It is not used to determine which blogs need to be upgraded.
This table was introduced in 3.0 when the WPMU schema was merged #11644 and it appears the table has never been used in core and is therefore redundant and may as well be removed.

Props johnbillion, nacin, ryan, johnjamesjacoby, whyisjake.

Fixes #19755. See #41685.



git-svn-id: https://develop.svn.wordpress.org/trunk@46194 602fd350-edb4-49c9-b593-d223f7449a82
2019-09-19 22:06:41 +00:00
Sergey Biryukov
00b03f2a6f I18N: Capitalize translator comments consistently, add trailing punctuation.
Includes minor code layout fixes.

See #44360.

git-svn-id: https://develop.svn.wordpress.org/trunk@45932 602fd350-edb4-49c9-b593-d223f7449a82
2019-09-03 00:39:13 +00:00
Felix Arntz
4572bb0988 Multisite: Improve performance by caching not found lookups for sites and networks.
With this change, the result of a site or network lookup by ID will be cached even if the ID does not exist. When a new site or network is created, the cache for the respective new ID is cleared.

Props mnelson4, nielsdeblaauw.
Fixes #42251.


git-svn-id: https://develop.svn.wordpress.org/trunk@45910 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-29 12:41:45 +00:00
Gary Pendergast
9c3fb72719 Schema: Add an index to wp_options.autoload.
Most sites will be unaffected by this change, but those with a large number of rows in `wp_options`, only a small number of which have `autoload` set, will see a significant performance improvement.

Sites with a large number of rows in `wp_options`, with many of them having `autoload` set will unfortunately see a performance penalty on top of the already very slow queries they're running, but this should be the minority of cases.

Props DanBUK.
Fixes #24044.


git-svn-id: https://develop.svn.wordpress.org/trunk@45805 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-15 07:12:04 +00:00
Andrew Ozz
6dad32d2ae Admin email verification:
- Add the `admin_email_lifespan` option when installing. Fixes a bug where the verification screen is shown right after installation.
- Reset the same option when upgrading and the user doing the DB upgrade is not an admin. This will ensure the email verification is shown next time an admin logs in.
- Use `site_url()` instead of `network_site_url()` for the form action. The latter seems needed only for password reset.

See #46349.

git-svn-id: https://develop.svn.wordpress.org/trunk@45788 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-13 17:39:06 +00:00
Sergey Biryukov
9c1123fb26 Docs: Add missing description for $wp_rewrite global.
See #45604, #47110.

git-svn-id: https://develop.svn.wordpress.org/trunk@45735 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-04 01:18:54 +00:00
SergeyBiryukov
cb1d21191d Docs: Add missing description for $wpdb, $wp_db_version, and $wp_current_db_version globals.
Props mukesh27, utsav72640, immeet94, SergeyBiryukov.
See #45604.

git-svn-id: https://develop.svn.wordpress.org/trunk@45734 602fd350-edb4-49c9-b593-d223f7449a82
2019-08-04 01:11:01 +00:00
Sergey Biryukov
531d83a2f0 I18N: Move the strings for default user roles to wp-includes/capabilities.php, to make the translations available on the front end as well.
Props keraweb, ocean90.
Fixes #37539.

git-svn-id: https://develop.svn.wordpress.org/trunk@44976 602fd350-edb4-49c9-b593-d223f7449a82
2019-03-21 22:23:00 +00:00
Jonathan Desrosiers
02d3de004c Networks and Sites: Introduce populate_site_meta filter.
The `populate_site_meta` filter can be used to modify the site meta added during the creation of a new site. This filter mirrors the approach used for networks in `populate_network_meta`.

Props spacedmonkey, davidbaumwald.
Fixes #46437.

git-svn-id: https://develop.svn.wordpress.org/trunk@44912 602fd350-edb4-49c9-b593-d223f7449a82
2019-03-15 19:42:40 +00:00
Gary Pendergast
d70c159c96 Comments: Default the show_comments_cookies_opt_in checkbox to enabled.
This also updates the option label, to clarify that it needs to be enabled for comment cookies to work.

Props azaozz, pento, dhavalkasvala, desrosj, pputzer, mirkoschubert, ThemeZee.
Fixes #44736.



git-svn-id: https://develop.svn.wordpress.org/trunk@44683 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-21 22:56:31 +00:00
Felix Arntz
d50afa97a3 Upgrade/Install: Add missing call to clear site meta cache in populate_site_meta().
See #44896.


git-svn-id: https://develop.svn.wordpress.org/trunk@44526 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-09 21:28:21 +00:00
Felix Arntz
5fdfac40f2 Multisite: Move site-specific metadata integrations from the wrapper functions to the low-level Meta API functions.
This complements the work in [43729] and prepares site metadata for future REST API support.

Props spacedmonkey.
Fixes #45091. See #44467.


git-svn-id: https://develop.svn.wordpress.org/trunk@44468 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-08 08:47:37 +00:00
Gary Pendergast
ccc55debda General: Replace "Happy blogging" with "Happy publishing".
As of this commit, WordPress is no longer a simple blogging platform. It's now a comprehensive publishing solution.

This also replaces a couple of other "blog" references that were missed previously.

Props igmoweb, Valer1e, audrasjb, pento.
Fixes #41000.



git-svn-id: https://develop.svn.wordpress.org/trunk@44455 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-08 04:29:06 +00:00
Gary Pendergast
36949b760f Docs: Update @since for populate_site_meta().
Fixes #44896.



git-svn-id: https://develop.svn.wordpress.org/trunk@44450 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-08 03:17:16 +00:00
Gary Pendergast
c7ed2d098d Docs: Update @since for populate_network_meta().
Fixes #44895.



git-svn-id: https://develop.svn.wordpress.org/trunk@44449 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-08 03:16:04 +00:00
Gary Pendergast
6b9c60a98a Docs: Update @since for the optional $options parameter to populate_options().
Fixes #44893.



git-svn-id: https://develop.svn.wordpress.org/trunk@44448 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-08 03:14:09 +00:00
Felix Arntz
b33420db6c Upgrade/Install: Fix coding standard errors after [43629].
See #44896.


git-svn-id: https://develop.svn.wordpress.org/trunk@43630 602fd350-edb4-49c9-b593-d223f7449a82
2018-09-05 12:49:29 +00:00
Felix Arntz
46e5c6c91b Upgrade/Install: Introduce populate_site_meta().
Fixes #44896. See #41333.


git-svn-id: https://develop.svn.wordpress.org/trunk@43629 602fd350-edb4-49c9-b593-d223f7449a82
2018-09-05 11:01:36 +00:00
flixos90
88b725e1cb Upgrade/Install: Introduce populate_network_meta(), moving logic out of populate_network().
Fixes #44895. See #41333.


git-svn-id: https://develop.svn.wordpress.org/trunk@43628 602fd350-edb4-49c9-b593-d223f7449a82
2018-09-05 10:44:02 +00:00
Felix Arntz
f1e1b6299e Upgrade/Install: Add support for an optional $options parameter to populate_options().
Fixes #44893. See #41333.


git-svn-id: https://develop.svn.wordpress.org/trunk@43627 602fd350-edb4-49c9-b593-d223f7449a82
2018-09-05 09:38:04 +00:00
Gary Pendergast
a75d153eee Coding Standards: Upgrade WPCS to 1.0.0
WPCS 1.0.0 includes a bunch of new auto-fixers, which drops the number of coding standards issues across WordPress significantly. Prior to running the auto-fixers, there were 15,312 issues detected. With this commit, we now drop to 4,769 issues.

This change includes three notable additions:
- Multiline function calls must now put each parameter on a new line.
- Auto-formatting files is now part of the `grunt precommit` script. 
- Auto-fixable coding standards issues will now cause Travis failures.

Fixes #44600.



git-svn-id: https://develop.svn.wordpress.org/trunk@43571 602fd350-edb4-49c9-b593-d223f7449a82
2018-08-17 01:50:26 +00:00
Sergey Biryukov
ddc8f803c6 Privacy: Revert [43525].
The commenter cookies checkbox is not legally required, so should be disabled by default.

Fixes #44373.

git-svn-id: https://develop.svn.wordpress.org/trunk@43531 602fd350-edb4-49c9-b593-d223f7449a82
2018-07-24 17:05:56 +00:00
Sergey Biryukov
335b69cedc Privacy: Remove the setting to enable comment cookies consent added in [43469].
This needs some more work to ensure expected behaviour.

See #44373.

git-svn-id: https://develop.svn.wordpress.org/trunk@43525 602fd350-edb4-49c9-b593-d223f7449a82
2018-07-24 12:50:55 +00:00
Andrew Ozz
d8869384be Privacy: Add a setting to disable comment cookie consent.
Fixes #44373.

git-svn-id: https://develop.svn.wordpress.org/trunk@43469 602fd350-edb4-49c9-b593-d223f7449a82
2018-07-17 09:07:29 +00:00
Andrew Ozz
cc66df9b5c Privacy: add wp_page_for_privacy_policy to populate_options().
Props ocean90.
Fixes #44076.

git-svn-id: https://develop.svn.wordpress.org/trunk@43267 602fd350-edb4-49c9-b593-d223f7449a82
2018-05-14 16:59:46 +00:00
Felix Arntz
8e4bd924d2 Multisite: Introduce metadata for sites.
A new global multisite table `wp_blogmeta` is added to the database schema, and a set of `*_site_meta()` API functions are introduced.

The implementation fails gracefully when the new table is not yet available, which may happen especially shortly after the core update, before the network has been upgraded to the new database schema. The presence of the table is detected once and stored as a global setting on the main network.

Core does not yet use site metadata, but there are several use-cases to be implemented or explored in the near future, and it allows plugins to extend sites with arbitrary data, which will come in particularly handy with the upcoming REST API endpoint for sites.

Props spacedmonkey, johnjamesjacoby, jeremyfelt, flixos90.
Fixes #37923.


git-svn-id: https://develop.svn.wordpress.org/trunk@42836 602fd350-edb4-49c9-b593-d223f7449a82
2018-03-16 02:14:04 +00:00