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<title>[12323] sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php: Mu-plugins: Add a plugin to cache `wp_count_posts()` on the front-end.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/12323">12323</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/12323","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dd32</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-12-14 01:54:24 +0000 (Wed, 14 Dec 2022)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Mu-plugins: Add a plugin to cache `wp_count_posts()` on the front-end.
WordPress.org themes often call `wp_count_posts()` to get the published post count, for example, the WordPress.org Plugins & Theme directories, and the WordPress.org Showcase.
This mu-plugin pre-sets the 'counts' cache group (which is a non-persistent cache group) on the front-end using `wp_cache_get_last_changed()` to invalidate it.
This removes often the final non-cached SQL query on these sites.</pre>
<h3>Added Paths</h3>
<ul>
<li><a href="#sitestrunkwordpressorgpublic_htmlwpcontentmupluginspubcachewpcountpostsphp">sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="sitestrunkwordpressorgpublic_htmlwpcontentmupluginspubcachewpcountpostsphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php (rev 0)
+++ sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php 2022-12-14 01:54:24 UTC (rev 12323)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,69 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+namespace WordPressdotorg\MU_Plugin\Cache_wp_count_posts;
+/**
+ * Plugin Name: Add caching to wp_count_posts() on the front-end.
+ * Description: The 'counts' group is a non-persistent cache group, this adds some caching to wp_count_posts() outside of admin contexts.
+ */
+
+// Don't cache in the admin.
+if ( is_admin() ) {
+ return;
+}
+
+/**
+ * Pre-set any cached 'counts' for this site (The 'counts' group is non-persistent)
+ *
+ * The cache item will be empty, unless wp_count_posts() is used on the front-end.
+ */
+function init() {
+ $caches = wp_cache_get( cache_key(), 'wp_count_posts' ) ?: [];
+
+ foreach ( $caches as $cache_key => $counts ) {
+ wp_cache_set( $cache_key, $counts, 'counts' );
+ }
+}
+add_action( 'init', __NAMESPACE__ . '\init', 8 );
+
+/**
+ * Filter wp_count_posts() and store any new values in the cache for the next page load.
+ *
+ * If the $perm is set to anything non-falsey and the user is logged in, the value will not be cached.
+ *
+ * @param stdClass $counts An object containing the current post_type's post
+ * counts by status.
+ * @param string $type Post type.
+ * @param string $perm The permission to determine if the posts are 'readable'
+ * by the current user.
+ * @return stdClass $counts unchanged.
+ */
+function filter_wp_count_posts( $counts, $post_type, $perm ) {
+ // $perm is permission, and ends up being per-user specific caches. Don't cache those.
+ if ( $perm && is_user_logged_in() ) {
+ return $counts;
+ }
+
+ // This function is marked private, and may be removed in the future.
+ if ( ! function_exists( '_count_posts_cache_key' ) ) {
+ return $counts;
+ }
+
+ $cache_key = _count_posts_cache_key( $post_type, $perm );
+ $caches = wp_cache_get( cache_key(), 'wp_count_posts' ) ?: [];
+
+ if ( empty( $caches[ $cache_key ] ) ) {
+ $caches[ $cache_key ] = $counts;
+ wp_cache_set( cache_key(), $caches, 'wp_count_posts', HOUR_IN_SECONDS );
+ }
+
+ return $counts;
+}
+add_filter( 'wp_count_posts', __NAMESPACE__ . '\filter_wp_count_posts', 20, 3 );
+
+/**
+ * Generate the cache key to look in for the wp_count_posts() cache.
+ *
+ * We're keying by the posts last_modified date to avoid needing to hook to post_status change events.
+ */
+function cache_key() {
+ return wp_cache_get_last_changed( 'posts' ) . 'wp_count_posts';
+}
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of file
</span><span class="cx" style="display: block; padding: 0 10px">Property changes on: sites/trunk/wordpress.org/public_html/wp-content/mu-plugins/pub/cache-wp-count-posts.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
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