Enable the storing of post meta in revisions including autosaves and previews:
Add a new argument `revisions_enabled` to the `register_meta` function which enables storing meta in revisions.
Add a new `wp_post_revision_meta_keys` filter which developers can use to control which meta is revisioned - it passes an array of the meta keys with revisions enabled as well as the post type.
Meta keys with revisions enabled are also stored for autosaves, and are restored when a revision or autosave is restored. In addition, meta values are now stored with the autosave revision used for previews. Changes to meta can now be previewed correctly without overwriting the published meta (see #20299) or passing data as a query variable, as the editor currently does to preview changes to the featured image.
Changes to meta with revisions enabled are considered when determining if a new revision should be created. A new revision is created if the meta value has changed since the last revision.
Revisions are now saved on the `wp_after_insert_post` hook instead of `post_updated`. The `wp_after_insert_post` action is fired after post meta has been saved by the REST API which enables attaching meta to the revision. To ensure backwards compatibility with existing action uses, `wp_save_post_revision_on_insert` function exits early if plugins have removed the previous `do_action( 'post_updated', 'wp_save_post_revision' )` call.
Props: alexkingorg, johnbillion, markjaquith, WraithKenny, kovshenin, azaozz, tv-productions, p51labs, mattheu, mikeschroder, Mamaduka, ellatrix, timothyblynjacobs, jakemgold, bookwyrm, ryanduff, mintindeed, wonderboymusic, sanchothefat, westonruter, spacedmonkey, hellofromTonya, drewapicture, adamsilverstein, swisspiddy.
Fixes#20564, #20299.
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In [55818] did a check to see if `WP_Metadata_Lazyloader` class existed and the loaded in the class file if it did not. However, require in wp-settings.php was not removed and resulted in the class being loaded twice. To be safe, only include the class file in meta.php and remove from wp-settings.php file.
Props spacedmonkey, ryelle.
See #58185.
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Follow on from [55747].
As `get_sites` can be called very early in the bootstrap process, like in the sunrise.php file, it means that the `WP_Metadata_Lazyloader` may not have been loaded yet in the wp-settings.php file. Add a simple check to see if the class exists and if it does not exist then load the class file in.
Props spacedmonkey, peterwilsoncc, dd32.
See #58185.
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Implement the `wp_cache_add_multiple`, `wp_cache_set_multiple` and `wp_cache_delete_multiple` in a number of core functions after they were introduced in [52700]
Props: spacedmonkey, adamsilverstein, flixos90, mitogh.
Fixes: #55029.
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In `add_{$meta_type}_meta`, `added_{$meta_type}_meta`, `update_{$meta_type}_meta`, `updated_{$meta_type}_meta`, `delete_{$meta_type}_meta`, and `deleted_{$meta_type}_meta` hooks, the `$_meta_value` parameter was documented as "Serialized if non-scalar". However, `$_meta_value` is a copy of the raw meta value before `maybe_serialize` is run and is not serialized. This change updates each of the above hooks' docblocks to remove "Serialized if non-scalar" from the `$_meta_value` parameter description.
Props pputzer, hasanuzzamanshamim.
Fixes#53102.
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[48658] documented that various metadata functions return false for an invalid ID. However, that does not clarify what an invalid ID is: a non-numeric, zero, or negative value. This change adds the clarification in all relevant metadata function docblocks.
Props icopydoc, SergeyBiryukov, davidkryzaniak, audrasjb.
Fixes#51797.
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Using the canonical function name for PHP functions is strongly recommended, as aliases may be deprecated or removed without (much) warning.
This replaces all uses of the following:
* `join()` with `implode()`
* `sizeof()` with `count()`
* `is_writeable()` with `is_writable()`
* `doubleval()` with a `(float)` cast
In part, this is a follow-up to #47746.
Props jrf.
See #50767.
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The order of parameters in `get_metadata_default()` did not match the signature of `get_metadata()`. This could be confusing for developers who are familiar with the existing metadata API.
Fixes#43941.
Props SergeyBiryukov, spacedmonkey, johnjamesjacoby.
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The `register_meta()` API now officially supports specifying a default metadata value. When `get_metadata()` is called for a meta key that does not yet exist for the object, this default value will be returned instead of an empty string.
A new function is introduced `get_metadata_raw` to retrieve the raw metadata value from the database, without applying the registered default.
Props spacedmonkey, flixos90, rmccue, kadamwhite, mnelson4, johnbillion, chrisvanpatten, TimothyBlynJacobs.
Fixes#43941.
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“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.
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This adds a more specific description for accepted object types: `post`, `comment`, `term`, `user`, or any other object type with an associated meta table.
Props sheparddw, kraftbj, DrewAPicture, SergeyBiryukov.
Fixes#45464.
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The purpose of meta registration is to assert that the meta key will contain a predictable value conforming to a schema, so the schema is therefore considered to be required.
Props TimothyBlynJacobs, grapplerulrich.
Fixes#43392.
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PHP 7.4 addes a warning when trying access a null/bool/int/float/resource (everything but array, string and object) as if it were an array.
This change fixes all of these warnings visible in unit tests.
Props jrf.
See #47704.
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