When the XML sitemaps feature was originally introduced, the `lastmod` field was omitted because guidance at the time indicated it was less important for search engines, plus for some entities it was computationally expensive to add. Now that the guidance has slightly changed, we are revisiting this and adding `lastmod` where easily possible.
- Adds `lastmod` to all individual post objects (of any post type) in the sitemap
- Adds `lastmod` to the homepage sitemap entry if the homepage is set to display the latest posts.
No `lastmod` is added for the individual sitemap pages in the sitemap index, nor for term archives or user archives. Those enhancements require additional changes, such as storing the modified date for a taxonomy term when something is added to that term. They can be revisited in separate follow-up tickets.
Props swissspidy, joemcgill.
Fixes#52099
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Includes minor formatting edits for consistency.
Follow-up to [53/tests], [12179], [12946], [35288], [37884], [38810], [38928], [46596], [48131], [52955], [53548], [53813], [53873], [54118], [54316], [54420], [54421], [54803].
See #56792.
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In each child class, renames the parameter to match the parent's method signature.
Why? PHP 8 introduces the ability to pass named arguments to function/method calls. This means the child and parent method signatures (i.e. parameter names) need to match.
Adds @since to clearly specify why the change happened.
Reassigns the generic parameter to the original parameter.
Why? Restoring the original name keeps the context intact within the method and makes the code more readable. An inline comment explains why this reassignment is made.
Note: Reassignment is done after the guard clause.
Why? To avoid unnecessary processing and memory should the method bail out.
Follow-up to [48072].
Props jrf, hellofromTonya, sergeybiryukov, azaozz, desrosj, johnbillion.
See #51553.
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In each child and grandchild class, renames the second parameter to match the parent's method signature.
Why? PHP 8 introduces the ability to pass named arguments to function/method calls. This means the child and parent method signatures (i.e. parameter names) need to match.
Adds @since to clearly specify why the change happened.
Reassigns the generic parameter to the original parameter.
Why? Restoring the original name keeps the context intact within the method and makes the code more readable. An inline comment explains why this reassignment is made.
Follow-up to [48072].
Props jrf, hellofromTonya, sergeybiryukov, azaozz, desrosj, johnbillion.
See #51553.
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If there are no pages and no static homepage, there will still be one sitemap including the homepage URL.
This change ensures that this sitemap is correctly listed in the sitemap index.
Props Chouby, pacifika, elrae.
Fixes#50571.
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While web crawlers are able to discover pages from links within the site and from other sites, XML sitemaps supplement this approach by allowing crawlers to quickly and comprehensively identify all URLs included in the sitemap and learn other signals about those URLs using the associated metadata.
See https://make.wordpress.org/core/2020/06/10/merge-announcement-extensible-core-sitemaps/ for more details.
This feature exposes the sitemap index via `/wp-sitemap.xml` and exposes a variety of new filters and hooks for developers to modify the behavior. Users can disable sitemaps completely by turning off search engine visibility in WordPress admin.
This change also introduces a new `esc_xml()` function to escape strings for output in XML, as well as XML support to `wp_kses_normalize_entities()`.
Props Adrian McShane, afragen, adamsilverstein, casiepa, flixos90, garrett-eclipse, joemcgill, kburgoine, kraftbj, milana_cap, pacifika, pbiron, pfefferle, Ruxandra Gradina, swissspidy, szepeviktor, tangrufus, tweetythierry.
Fixes#50117.
See #3670. See #19998.
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