WP_REST_Revisions_Controller::get_items PHP Method

    public function get_items($request)
    {
        $parent = get_post($request['parent']);
        if (!$request['parent'] || !$parent || $this->parent_post_type !== $parent->post_type) {
            return new WP_Error('rest_post_invalid_parent', __('Invalid post parent ID.'), array('status' => 404));
        }
        $revisions = wp_get_post_revisions($request['parent']);
        $response = array();
        foreach ($revisions as $revision) {
            $data = $this->prepare_item_for_response($revision, $request);
            $response[] = $this->prepare_response_for_collection($data);
        }
        return rest_ensure_response($response);
    }