Adds `wp_theme_has_theme_json()` for public consumption, to replace the private internal Core-only `WP_Theme_JSON_Resolver::theme_has_support()` method. This new global function checks if a theme or its parent has a `theme.json` file.
For performance, results are cached as an integer `1` or `0` in the `'theme_json'` group with `'wp_theme_has_theme_json'` key. This is a non-persistent cache. Why? To make the derived data from `theme.json` is always fresh from the potential modifications done via hooks that can use dynamic data (modify the stylesheet depending on some option, settings depending on user permissions, etc.).
Also adds a new public function `wp_clean_theme_json_cache()` to clear the cache on `'switch_theme'` and `start_previewing_theme'`.
References:
* [https://github.com/WordPress/gutenberg/pull/45168 Gutenberg PR 45168] Add `wp_theme_has_theme_json` as a public API to know whether a theme has a `theme.json`.
* [https://github.com/WordPress/gutenberg/pull/45380 Gutenberg PR 45380] Deprecate `WP_Theme_JSON_Resolver:theme_has_support()`.
* [https://github.com/WordPress/gutenberg/pull/46150 Gutenberg PR 46150] Make `theme.json` object caches non-persistent.
* [https://github.com/WordPress/gutenberg/pull/45979 Gutenberg PR 45979] Don't check if constants set by `wp_initial_constants()` are defined.
* [https://github.com/WordPress/gutenberg/pull/45950 Gutenberg PR 45950] Cleaner logic in `wp_theme_has_theme_json`.
Follow-up to [54493], [53282], [52744], [52049], [50959].
Props oandregal, afragen, alexstine, aristath, azaozz, costdev, flixos90, hellofromTonya, mamaduka, mcsf, ocean90, spacedmonkey.
Fixes#56975.
Built from https://develop.svn.wordpress.org/trunk@55086
git-svn-id: http://core.svn.wordpress.org/trunk@54619 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Calling the `wp_get_theme` function creates a instance of the `WP_Theme` class. This can be a performance issue, if all you need is one property of the class instance. This change replaces the usage of `wp_get_theme()->get_stylesheet()` with `get_stylesheet()` to improve performance.
Props spacedmonkey, flixos90, peterwilsoncc, desrosj.
Fixes#57057.
Built from https://develop.svn.wordpress.org/trunk@54817
git-svn-id: http://core.svn.wordpress.org/trunk@54369 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When passing args to `WP_Query::__construct` method (in this case, but creating a `new WP_Query`, this one internally executes the `WP_Query::get_posts` method and stores the result in the `WP_Query::posts` property. When calling the `WP_Query::get_posts` again, the same SQL query gets executed, and the result is again stored in the `WP_Query::posts` property.
This was introduced in [51003].
Props david.binda, jorbin.
Fixes#53280. See #53176.
Built from https://develop.svn.wordpress.org/trunk@51144
git-svn-id: http://core.svn.wordpress.org/trunk@50753 1a063a9b-81f0-0310-95a4-ce76da25c4cd
hellofromTonya
spacedmonkey
Sergey Biryukov
youknowriad
audrasjb
noisysocks
jorgefilipecosta
Aaron Jorbin