+ /**
+ * Filter whether the user is allowed to add post meta to a post.
+ *
+ * The dynamic portion of the hook name, $meta_key, refers to the
+ * meta key passed to map_meta_cap().
+ *
+ * @since 3.3.0
+ *
+ * @param bool $allowed Whether the user can add the post meta. Default false.
+ * @param string $meta_key The meta key.
+ * @param int $post_id Post ID.
+ * @param int $user_id User ID.
+ * @param string $cap Capability name.
+ * @param array $caps User capabilities.
+ */