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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WordPress has supported custom page templates for over 12 years, allowing developers to create various layouts for specific pages.
While this feature is very helpful, it has always been limited to the 'page' post type and not was not available to other post types.
By opening up the page template functionality to all post types, we continue to improve the template hierarchy's flexibility.
In addition to the `Template Name` file header, the post types supported by a template can be specified using `Template Post Type: post, foo, bar`.
When at least one template exists for a post type, the 'Post Attributes' meta box will be displayed in the back end, without the need to add post type support for `'page-attributes'`. 'Post Attributes' can be customized per post type using the `'attributes'` label when registering a post type.
Props johnbillion, Mte90, dipesh.kakadiya, swissspidy.
Fixes#18375.
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When support for PDFs is available, on upload,
render 'Thumbnail', 'Medium', 'Large', and 'Full' sizes of
the first page, and save them in attachment meta.
Use these renders within Add Media, Media Gallery and List views,
Attachment Details, Post/Attachment Edit screens, and Attachment pages.
Support available by default via Imagick -> ImageMagick -> Ghostscript,
but can be provided by any `WP_Image_Editor` that supports PDFs.
Props adamsilverstein, azaozz, celloexpressions, desrosj, dglingren, ericlewis, ipstenu, joemcgill, joyously, markoheijnen, melchoyce, mikeschroder, tomauger.
Fixes#31050.
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Introduces new control for managing the background position. Adds control for setting the `background-size`.
Props cdog, celloexpressions, grapplerulrich, MikeHansenMe, FolioVision, afercia, helen, melchoyce, karmatosed, westonruter, Kelderic, sebastian.pisula.
Fixes#22058.
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Like its predecessor (`sanitize_text_field()`), `sanitize_textarea_field()` is a helper function to sanitise user input. As the name suggests, this function is for sanitising input from `textarea` fields - it strips tags and invalid UTF-8 characters, like `sanitize_text_field()`, but retains newlines and extra inline whitespace.
Props ottok, nbachiyski, chriscct7, pento.
Fixes#32257.
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When a site is using a static front page, and that page is in a menu, it isn't given the CSS class `menu-item-home`, contrary to the developer documentation.
An incorrect solution was originally added in [35272], and is now gone. Let us never speak of it again.
Props mdgl, adamsilverstein, welcher, pento.
Fixes#35272.
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`get_site()` has replaced `get_blog_details()` throughout core and is the recommended way to retrieve a current or single site object.
The `blog_details` filter is applied when full details are requested from `get_blog_details()`.
To ensure backwards compatibility in the switch to `get_site()`, this `blog_details` filter is now applied in `WP_Site::get_details()` and marked as deprecated with a note to rely instead on the `site_details` filter introduced in 4.6.
Props flixos90.
See #37102.
Fixes#38491.
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The color control in the customizer can use the new mode by supplying the `mode` param with `hue` (as opposed to the new default `full` value). New control replaces the `range` control in Twenty Seventeen for `colorscheme_hue`. The `wpColorPicker` can opt for hue-only mode via supplying `hue` as the `type` option. Iris Color Picker is updated from v1.0.7 to v1.1.0-beta.
Props mattwiebe, celloexpressions.
Fixes#38263.
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In addition to `wp_list_filter()` for filtering a list of objects, and `wp_list_pluck()` for plucking a certain field out of each object in a list, this new function can be used for sorting a list of objects by specific fields. These functions are now all contained within the new `WP_List_Util()` class and `wp_list_sort()` is used in various parts of core for sorting lists.
This was previously committed in [38859] but got reverted in [38862] and [38863]. To fix the previous issues, `wp_list_sort()` supports now an additional argument to preserve array keys via `uasort()`.
Props flixos90, DrewAPicture, jorbin.
Fixes#37128.
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Fixes bug where an invalid Last-Modified value would be returned in feed requests for sites that had 0 items to return. Comment or post feeds will now return the current timestamp as the Last-Modified header value. Example: a request for the comments feed for a site without any comments.
Replaced use of the local static variable `$cache_lastcommentmodified` to store the modified date in `get_lastcommentmodified()` with the Object Cache API. The `get_lastcommentmodified()` function returns early if there is a cached value and returns `false` if there where no comments found. Introduced `_clear_modified_cache_on_transition_comment_status()` to flush the `lastcommentmodified` cache key when a comment enters or leaves approval status. In `get_lastpostmodified()` return early if there is a cached value and return `false` if there are no posts found.
Props swissspidy, rachelbaker, dllh, leobaiano.
Fixes#38027.
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This brings the custom colors CSS in line with the stylesheet. Some selectors were missing since many changes occurred in `style.css` a few days before the original merge to Core.
Props celloexpressions, laurelfulford.
Fixes#38389.
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Previously, if an invalid post status was assigned to a media object, the object would be returned with an unchanged status. After [38911], an error response is returned.
The assertion in test_get_items_invalid_status_param_is_discarded() needs to be updated to account for the expected error response. The test name has been changed to `test_get_items_invalid_status_param_is_error_response()`.
Fixes#38417.
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Pass `false` as the `$passed_default` value when the `default_option_{$option}` filter is applied in `update_option` as no default is ever passed.
This resolves an error in tests where the 3rd parameter is not available to `filter_default_option()`.
Fixes#38176.
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