Ticket #35658: 35658.20.diff

src/wp-includes/meta.php

@@ -1002 +1002 @@
  *     @type string $sanitize_callback A function or method to call when sanitizing `$meta_key` data.
  *     @type string $auth_callback     Optional. A function or method to call when performing edit_post_meta, add_post_meta, and delete_post_meta capability checks.
  *     @type bool   $show_in_rest      Whether data associated with this meta key can be considered public.
+ *     @type bool   $single            Whether the meta key has one value per object, or an array of values per object.
  * }
  * @param string|array $auth_callback Deprecated. Use `$args` instead.
  *
@@ -1028 +1029 @@
                 'sanitize_callback' => null,
                 'auth_callback'     => null,
                 'show_in_rest'      => false,
+                'single'            => false,
         );
 
         $passed_args = array_slice( func_get_args(), 2 );
@@ -1227 +1229 @@
                         return new WP_Error( 'invalid_meta_key', __( 'Invalid meta key. Not registered.' ) );
                 }
                 $meta_keys = get_registered_meta_keys( $object_type, $object_subtype );
-                $meta_key_data = $meta_keys[ $object_type ][ $object_subtype ][ $meta_key ];
+                $meta_key_data = $meta_keys[ $meta_key ];
 
-                $data = get_metadata( $object_type, $object_id, $meta_key, $meta_key_data->single );
+                $data = get_metadata( $object_type, $object_id, $meta_key, $meta_key_data['single'] );
 
                 return $data;
         }