Ticket #36707: 36707.diff

src/wp-includes/user.php

@@ -578 +578 @@
         if ( empty( $user_id ) )
                 return array();
 
+        /**
+         * Filter the list of a user's sites before it is populated.
+         *
+         * Returning a populated array effectively short circuits `get_blogs_of_user()`.
+         *
+         * @since 4.6.0
+         *
+         * @param array $blogs   An array of WP_Site objects of which the user is a member. Default is an empty array.
+         * @param int   $user_id User ID.
+         * @param bool  $all     Whether the returned array should contain all sites, including
+         *                       those marked 'deleted', 'archived', or 'spam'. Default false.
+         */
+        $blogs = apply_filters( 'pre_get_blogs_of_user', array(), $user_id, $all );
+
+        if ( is_array( $blogs ) && 0 < count( $blogs ) ) {
+                return $blogs;
+        }
+
         $keys = get_user_meta( $user_id );
         if ( empty( $keys ) )
                 return array();