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SEO: Replace the copied hreflang code with one shared implementation that sites turn on - #1256
The code that lists every locale’s copy of a page as a hreflang alternate exists four times: in the wporg theme, wporg-main-2022, the theme directory and the plugin directory. A site that lacks the links, like https://wordpress.org/gutenberg/, could only get them with a fifth copy.
mu-plugins/pub/wporg-seo/hreflang.php has been an empty file with its include commented out since the SEO plugin was added. This fills it in and moves the three copies in this repository onto it.
The shared code
get_sites() returns the locale sites, built the same way as the existing copies: same query and same unsupported-language list.
output_links() is hooked to wp_head and prints the links for the current page, taking the path from the canonical URL the same plugin already computes.
It prints nothing unless the site turns it on with add_filter( 'wporg_hreflang_enabled', '__return_true' ). Many sites have no locale copies (Make, Developer, Photos, Documentation), so it is off by default, and a site that is off pays one filter call.
wporg_hreflang_sites filters the list for the current page.
The list has its own cache entry, hreflang-sites. The plugin directory stored a differently shaped list under the shared local-sites key, which could still be cached at deploy. Rosetta clears the new entry along with the old one.
Theme directory
Its copy did the same thing as the shared code, so it is deleted and replaced with the one-line filter.
Plugin directory
Its copy is deleted. A plugin page only lists the locales the plugin is at least 95% translated into, plus the current locale, so Template::hreflang_sites() keeps that narrowing on the wporg_hreflang_sites filter. It caches the plugin’s translated locales for a day, as before, but no longer caches the visitor’s locale along with them.
The links move from wp_head priority 2 to the default, so they print lower in <head>, after the canonical link.
wporg theme
Its copy is deleted. Only its child theme wporg-main still used the links, on the few pages it renders that have locale copies (https://wordpress.org/40-percent-of-web/, https://de.wordpress.org/about/privacy/cookies/). That theme used to unhook the parent’s function everywhere else; enable_hreflang_tags() now turns the shared links on under the same conditions.
Openverse, the photo directory and translate.wordpress.org only unhooked the parent’s function, so those calls are removed.
Not in this PR
wporg-main-2022 still carries its copy, in its own repository.
The Gutenberg site needs the one-line filter in its theme to close the ticket.
Testing
phpcs and the Plugin Directory, Theme Directory, Photo Directory and Openverse suites pass. Nothing covers the links themselves, and the list needs the wporg_locales table, so this is a sandbox check. For each URL, compare curl -s <url> | grep -o 'hreflang="[^"]*"' | sort | md5 before and after applying:
Same subset on a plugin page such as https://wordpress.org/plugins/akismet/. It can be one short of production when production’s cached list includes another visitor’s locale.
…g alternates
The locale list behind the hreflang links is copied into the wporg theme, the
main theme, the theme directory and the plugin directory, so a site that lacks
the links can only get them with another copy.
Fill in the empty wporg-seo/hreflang.php with that list and a function that
prints the links for a path. Nothing is hooked, so no site's output changes;
the existing copies can move over one at a time.
See #4897.
Co-Authored-By: Claude Mythos 5.2 <noreply@anthropic.com>
The SEO plugin now loads hreflang support. The added code selects and caches supported locale sites, then emits escaped alternate links for non-REST requests.
Changes: Hreflang support
Layer / File(s)
Summary
Locale site selection wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-seo/hreflang.php
Adds an unsupported-language list and get_sites(). The function filters locale sites, derives hreflang values, adds en_US and x-default, sorts the results, and uses the shared cache.
Plugin loading and alternate-link output wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-seo/wporg-seo.php, wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-seo/hreflang.php
Changes the plugin to require hreflang.php. Adds the_links(), which emits escaped alternate links and returns without output during REST requests.
sequenceDiagram
participant Caller
participant the_links
participant get_sites
participant local_sites_cache
participant GlotPress_locale_query
Caller->>the_links: Request alternate links for a path
the_links->>get_sites: Retrieve locale sites
get_sites->>local_sites_cache: Read or store locale sites
get_sites->>GlotPress_locale_query: Query locale data when needed
get_sites-->>the_links: Return sorted locale sites
the_links-->>Caller: Emit escaped alternate links unless this is a REST request
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Merge Risk: Low · previous review 938f7
This change adds opt-in hreflang helpers and does not change any site's output until a site calls them. If a future caller passes a path without a leading slash, the alternate links would point to the wrong host. Normalizing the path is a one-line fix and can be handled before or shortly after merge.
Pre-merge checks: 4
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The title names the main change: the copied hreflang code is replaced by one shared implementation in hreflang.php, and sites opt in by calling the_links(). The raw summary and PR objectives both conf…
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Explanation
The title names the main change: the copied hreflang code is replaced by one shared implementation in hreflang.php, and sites opt in by calling the_links(). The raw summary and PR objectives both confirm this: get_sites() and the_links() are added, the wporg-seo.php include is enabled, and existing copies are left for follow-ups. The title uses the 'SEO:' prefix and is 87 characters, which is a bit long but still clear and specific.
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…opies
Every existing copy of the hreflang code returns early on a 404, so a page
that doesn't exist doesn't list locale copies of itself. the_links() only
kept the REST check; add the 404 check next to it so callers moving over
keep that behavior without repeating it.
See #4897.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at
@wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-seo/hreflang.php:
- Around line 182-184: Normalize the path in the `the_links()` URL construction
so inputs with or without leading slashes produce a valid absolute URL. Ensure
the resulting path has exactly one leading slash while preserving the remaining
path, and leave the host and subdomain logic unchanged.
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Hook the links into `wp_head` here, for the sites listed in SITE_PATHS, so a
site gets them without any code of its own. The list starts with the Gutenberg
site; the sites that still print their own links join it as that code is
removed.
Fixes #4897.
Co-Authored-By: Claude Mythos 5.2 <noreply@anthropic.com>
obenland
changed the title
SEO: Give sites one shared way to list their locale copies as hreflang alternates
SEO: Point search engines to the localized Gutenberg pages from one shared hreflang implementation
Nov 12, 2026
Both directories carried their own copy of the locale list. Drop the copies and
list the two sites in SITE_PATHS instead.
A plugin page only lists the locales the plugin is translated into, so the
shared list gets a `wporg_hreflang_sites` filter and the plugin directory keeps
just that narrowing.
The shared list moves to its own cache entry. The plugin directory used to
store a differently shaped list under `local-sites`, which could still be
cached when this deploys.
See #4897.
Co-Authored-By: Claude Mythos 5.2 <noreply@anthropic.com>
…eir path
Checking the site's path against a list ran on every request across the
network. A site with locale copies now turns the links on with the
`wporg_hreflang_enabled` filter, so everywhere else the hook costs one filter
call.
See #4897.
Co-Authored-By: Claude Mythos 5.2 <noreply@anthropic.com>
obenland
changed the title
SEO: Point search engines to the localized Gutenberg pages from one shared hreflang implementation
SEO: Replace the copied hreflang code with one shared implementation that sites turn on
Nov 12, 2026
Drop the theme's copy of the locale list. Its child theme wporg-main already
decided per page whether the links apply, by unhooking the parent's function;
it now turns the shared links on for the same pages instead.
Openverse, the photo directory and translate.wordpress.org only unhooked the
parent's function. With the links off by default they have nothing to unhook.
See #4897.
Co-Authored-By: Claude Mythos 5.2 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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obenland
changed the title
See https://meta.trac.wordpress.org/ticket/4897
The code that lists every locale’s copy of a page as a
hreflangalternate exists four times: in thewporgtheme,wporg-main-2022, the theme directory and the plugin directory. A site that lacks the links, like https://wordpress.org/gutenberg/, could only get them with a fifth copy.mu-plugins/pub/wporg-seo/hreflang.phphas been an empty file with its include commented out since the SEO plugin was added. This fills it in and moves the three copies in this repository onto it.The shared code
get_sites()returns the locale sites, built the same way as the existing copies: same query and same unsupported-language list.output_links()is hooked towp_headand prints the links for the current page, taking the path from the canonical URL the same plugin already computes.add_filter( 'wporg_hreflang_enabled', '__return_true' ). Many sites have no locale copies (Make, Developer, Photos, Documentation), so it is off by default, and a site that is off pays one filter call.wporg_hreflang_sitesfilters the list for the current page.hreflang-sites. The plugin directory stored a differently shaped list under the sharedlocal-siteskey, which could still be cached at deploy. Rosetta clears the new entry along with the old one.Theme directory
Its copy did the same thing as the shared code, so it is deleted and replaced with the one-line filter.
Plugin directory
Its copy is deleted. A plugin page only lists the locales the plugin is at least 95% translated into, plus the current locale, so
Template::hreflang_sites()keeps that narrowing on thewporg_hreflang_sitesfilter. It caches the plugin’s translated locales for a day, as before, but no longer caches the visitor’s locale along with them.The links move from
wp_headpriority 2 to the default, so they print lower in<head>, after the canonical link.wporgthemeIts copy is deleted. Only its child theme
wporg-mainstill used the links, on the few pages it renders that have locale copies (https://wordpress.org/40-percent-of-web/, https://de.wordpress.org/about/privacy/cookies/). That theme used to unhook the parent’s function everywhere else;enable_hreflang_tags()now turns the shared links on under the same conditions.Openverse, the photo directory and translate.wordpress.org only unhooked the parent’s function, so those calls are removed.
Not in this PR
wporg-main-2022still carries its copy, in its own repository.Testing
phpcsand the Plugin Directory, Theme Directory, Photo Directory and Openverse suites pass. Nothing covers the links themselves, and the list needs thewporg_localestable, so this is a sandbox check. For each URL, comparecurl -s <url> | grep -o 'hreflang="[^"]*"' | sort | md5before and after applying:wporg-main-2022): https://wordpress.org/download/.Props jonoaldersonwp, diddledani.
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