Ticket #37114: 37114.0.patch

src/wp-includes/post-template.php

@@ -445 +445 @@
  * @return array Array of classes.
  */
 function get_post_class( $class = '', $post_id = null ) {
+        /**
+         * Filters the get_post_class result before any Database requests are made.
+         *
+         * This allows one to short-circuit the default logic, perhaps by
+         * replacing it with a routine that is more optimal for your setup.
+         *
+         * Passing a non-null value to the filter will effectively short-circuit retrieval,
+         * returning the passed value instead.
+         *
+         * @since 4.6
+         *
+         * @param null|string $result  The UNSANITIZED (and potentially unsafe) Classes that should be used for this post. Default null.
+         * @param string      $class   The UNSANITIZED (and potentially unsafe) Classes that were provided to the get_post_class initially.
+         * @param int|WP_Post $post_id Optional. Post ID or post object.
+         */
+        $pre = apply_filters( 'pre_post_class', null, $class, $post_id );
+
+        if ( null !== $pre ) {
+                return $pre;
+        }
+
         $post = get_post( $post_id );
 
         $classes = array();