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<title>[56528] Themes: Avoid stale caches for core block styles.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/56528">56528</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/56528","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>flixos90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-09-06 21:32:46 +0000 (Wed, 06 Sep 2023)</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'>Themes: Avoid stale caches for core block styles.

This fixes an issue introduced in <a href="https://core.trac.wordpress.org/changeset/56044">[56044]</a> in which the path to core block styles are cached to avoid expensive file operations on every page load. The original caching strategy is now modified so that only the path relative to the blocks location are stored, rather than the full path, since the path to the `wp-includes`` folder can change after the value is generated. The new cached value also includes the current WordPress version value to ensure it is rebuilt when the version changes.

Props lhe2012, coreyw, colorful tones, petitphp, mukesh27, spacedmonkey, joemcgill, flixos90, kimannwall, desmith.
Merges <a href="https://core.trac.wordpress.org/changeset/56524">[56524]</a> to the 6.3 branch.
Fixes <a href="https://core.trac.wordpress.org/ticket/59111">#59111</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches63srcwpincludesblocksindexphp">branches/6.3/src/wp-includes/blocks/index.php</a></li>
</ul>

<h3>Property Changed</h3>
<ul>
<li><a href="#branches63">branches/6.3/</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/6.3
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/6.3 2023-09-06 21:22:28 UTC (rev 56527)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/6.3  2023-09-06 21:32:46 UTC (rev 56528)
</ins><a id="branches63"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/6.3</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.5:49373-49379,49381
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.8:51889
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56381,56386,56401,56417,56422,56463,56490-56491
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56381,56386,56401,56417,56422,56463,56490-56491,56524
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches63srcwpincludesblocksindexphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/src/wp-includes/blocks/index.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/src/wp-includes/blocks/index.php     2023-09-06 21:22:28 UTC (rev 56527)
+++ branches/6.3/src/wp-includes/blocks/index.php       2023-09-06 21:32:46 UTC (rev 56528)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -20,46 +20,78 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * avoids unnecessary logic and filesystem lookups in the other function.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 6.3.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ *
+ * @global string $wp_version The WordPress version string.
</ins><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function register_core_block_style_handles() {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        global $wp_version;
+
</ins><span class="cx" style="display: block; padding: 0 10px">         if ( ! wp_should_load_separate_core_block_assets() ) {
</span><span class="cx" style="display: block; padding: 0 10px">                return;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        $blocks_url   = includes_url( 'blocks/' );
+       $suffix       = wp_scripts_get_suffix();
+       $wp_styles    = wp_styles();
+       $style_fields = array(
+               'style'       => 'style',
+               'editorStyle' => 'editor',
+       );
+
</ins><span class="cx" style="display: block; padding: 0 10px">         static $core_blocks_meta;
</span><span class="cx" style="display: block; padding: 0 10px">        if ( ! $core_blocks_meta ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $core_blocks_meta = require ABSPATH . WPINC . '/blocks/blocks-json.php';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $core_blocks_meta = require BLOCKS_PATH . 'blocks-json.php';
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $includes_url  = includes_url();
-       $includes_path = ABSPATH . WPINC . '/';
-       $suffix        = wp_scripts_get_suffix();
-       $wp_styles     = wp_styles();
-       $style_fields  = array(
-               'style'       => 'style',
-               'editorStyle' => 'editor',
-       );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $files          = false;
+       $transient_name = 'wp_core_block_css_files';
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /*
</span><span class="cx" style="display: block; padding: 0 10px">         * Ignore transient cache when the development mode is set to 'core'. Why? To avoid interfering with
</span><span class="cx" style="display: block; padding: 0 10px">         * the core developer's workflow.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        if ( ! wp_is_development_mode( 'core' ) ) {
-               $transient_name = 'wp_core_block_css_files';
-               $files          = get_transient( $transient_name );
-               if ( ! $files ) {
-                       $files = glob( wp_normalize_path( __DIR__ . '/**/**.css' ) );
-                       set_transient( $transient_name, $files );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $can_use_cached = ! wp_is_development_mode( 'core' );
+
+       if ( $can_use_cached ) {
+               $cached_files = get_transient( $transient_name );
+
+               // Check the validity of cached values by checking against the current WordPress version.
+               if (
+                       is_array( $cached_files )
+                       && isset( $cached_files['version'] )
+                       && $cached_files['version'] === $wp_version
+                       && isset( $cached_files['files'] )
+               ) {
+                       $files = $cached_files['files'];
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        } else {
-               $files = glob( wp_normalize_path( __DIR__ . '/**/**.css' ) );
</del><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $register_style = static function( $name, $filename, $style_handle ) use ( $includes_path, $includes_url, $suffix, $wp_styles, $files ) {
-               $style_path = "blocks/{$name}/{$filename}{$suffix}.css";
-               $path       = wp_normalize_path( $includes_path . $style_path );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! $files ) {
+               $files = glob( wp_normalize_path( BLOCKS_PATH . '**/**.css' ) );
+               $files = array_map(
+                       static function ( $file ) {
+                               return str_replace( BLOCKS_PATH, '', $file );
+                       },
+                       $files
+               );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( ! in_array( $path, $files, true ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         // Save core block style paths in cache when not in development mode.
+               if ( $can_use_cached ) {
+                       set_transient(
+                               $transient_name,
+                               array(
+                                       'version' => $wp_version,
+                                       'files'   => $files,
+                               )
+                       );
+               }
+       }
+
+       $register_style = static function( $name, $filename, $style_handle ) use ( $blocks_url, $suffix, $wp_styles, $files ) {
+               $style_path = "{$name}/{$filename}{$suffix}.css";
+               $path       = wp_normalize_path( BLOCKS_PATH . $style_path );
+
+               if ( ! in_array( $style_path, $files, true ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         $wp_styles->add(
</span><span class="cx" style="display: block; padding: 0 10px">                                $style_handle,
</span><span class="cx" style="display: block; padding: 0 10px">                                false
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -67,7 +99,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $wp_styles->add( $style_handle, $includes_url . $style_path );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $wp_styles->add( $style_handle, $blocks_url . $style_path );
</ins><span class="cx" style="display: block; padding: 0 10px">                 $wp_styles->add_data( $style_handle, 'path', $path );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $rtl_file = str_replace( "{$suffix}.css", "-rtl{$suffix}.css", $path );
</span></span></pre>
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