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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/58951">58951</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/58951","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>ramonopoly</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-08-29 05:39:22 +0000 (Thu, 29 Aug 2024)</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'>Block Styles: Ensure unique classname generation for variations

This commit simplifies block style variation class name generation to ensure unique class names by replacing the hashing of block attributes in the block style variation class names with a call to `wp_unique_id`.

Doing so avoids potential for non-unique class names and conflicting styles when exact copies of a block are inserted via a repeated pattern.


Props aaronrobertshaw, martinkrcho, mukesh27, peterwilsoncc, ramonopoly.

Fixes <a href="https://core.trac.wordpress.org/ticket/61877">#61877</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesblocksupportsblockstylevariationsphp">trunk/src/wp-includes/block-supports/block-style-variations.php</a></li>
<li><a href="#trunksrcwpincludesdeprecatedphp">trunk/src/wp-includes/deprecated.php</a></li>
<li><a href="#trunktestsphpunittestsblocksupportswpCreateBlockStyleVariationInstanceNamephp">trunk/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesblocksupportsblockstylevariationsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/block-supports/block-style-variations.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/block-supports/block-style-variations.php   2024-08-29 05:20:51 UTC (rev 58950)
+++ trunk/src/wp-includes/block-supports/block-style-variations.php     2024-08-29 05:39:22 UTC (rev 58951)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -8,21 +8,6 @@
</span><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"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Generate block style variation instance name.
- *
- * @since 6.6.0
- * @access private
- *
- * @param array  $block     Block object.
- * @param string $variation Slug for the block style variation.
- *
- * @return string The unique variation name.
- */
-function wp_create_block_style_variation_instance_name( $block, $variation ) {
-       return $variation . '--' . md5( serialize( $block ) );
-}
-
-/**
</del><span class="cx" style="display: block; padding: 0 10px">  * Determines the block style variation names within a CSS class string.
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @since 6.6.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -124,7 +109,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        wp_resolve_block_style_variation_ref_values( $variation_data, $theme_json );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $variation_instance = wp_create_block_style_variation_instance_name( $parsed_block, $variation );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $variation_instance = wp_unique_id( $variation . '--' );
</ins><span class="cx" style="display: block; padding: 0 10px">         $class_name         = "is-style-$variation_instance";
</span><span class="cx" style="display: block; padding: 0 10px">        $updated_class_name = $parsed_block['attrs']['className'] . " $class_name";
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -230,11 +215,9 @@
</span><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">         * Matches a class prefixed by `is-style`, followed by the
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * variation slug, then `--`, and finally a hash.
-        *
-        * See `wp_create_block_style_variation_instance_name` for class generation.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * variation slug, then `--`, and finally an instance number.
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        preg_match( '/\bis-style-(\S+?--\w+)\b/', $block['attrs']['className'], $matches );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ preg_match( '/\bis-style-(\S+?--\d+)\b/', $block['attrs']['className'], $matches );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        if ( empty( $matches ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                return $block_content;
</span></span></pre></div>
<a id="trunksrcwpincludesdeprecatedphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/deprecated.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/deprecated.php      2024-08-29 05:20:51 UTC (rev 58950)
+++ trunk/src/wp-includes/deprecated.php        2024-08-29 05:39:22 UTC (rev 58951)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -6387,3 +6387,21 @@
</span><span class="cx" style="display: block; padding: 0 10px">                wp_add_inline_style( 'global-styles', $custom_css );
</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">+
+/**
+ * Generate block style variation instance name.
+ *
+ * @since 6.6.0
+ * @deprecated 6.7.0 Use `wp_unique_id( $variation . '--' )` instead.
+ *
+ * @access private
+ *
+ * @param array  $block     Block object.
+ * @param string $variation Slug for the block style variation.
+ *
+ * @return string The unique variation name.
+ */
+function wp_create_block_style_variation_instance_name( $block, $variation ) {
+       _deprecated_function( __FUNCTION__, '6.7.0', 'wp_unique_id' );
+       return $variation . '--' . md5( serialize( $block ) );
+}
</ins></span></pre></div>
<a id="trunktestsphpunittestsblocksupportswpCreateBlockStyleVariationInstanceNamephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php      2024-08-29 05:20:51 UTC (rev 58950)
+++ trunk/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php        2024-08-29 05:39:22 UTC (rev 58951)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13,6 +13,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 61312
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @covers ::wp_create_block_style_variation_instance_name
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         *
+        * @expectedDeprecated wp_create_block_style_variation_instance_name
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><span class="cx" style="display: block; padding: 0 10px">        public function test_block_style_variation_instance_name_generation() {
</span><span class="cx" style="display: block; padding: 0 10px">                $block    = array( 'name' => 'test/block' );
</span></span></pre>
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