) {
			$path = $this->get_wpml_flags_directory() . $file;
			if ( $this->flag_file_exists( $path ) ) {
				$ext = pathinfo( $path, PATHINFO_EXTENSION );
				if ( in_array( $ext, $allowed_file_types, true ) ) {
					$result[] = $file;
				}
			}
		}

		return $result;
	}

	/**
	 * @param string $base_url
	 * @param string $path
	 *
	 * @return string
	 */
	private function append_path_to_url( $base_url, $path ) {
		$base_url_parts = wp_parse_url( $base_url );

		$base_url_path_components = array();
		if ( $base_url_parts && array_key_exists( 'path', $base_url_parts ) ) {
			$base_url_path_components = explode( '/', untrailingslashit( $base_url_parts['path'] ) );
		}

		$sub_dir_path_components = explode( '/', trim( $path, '/' ) );
		foreach ( $sub_dir_path_components as $sub_dir_path_part ) {
			$base_url_path_components[] = $sub_dir_path_part;
		}

		$base_url_parts['path'] = implode( '/', $base_url_path_components );

		return http_build_url( $base_url_parts );
	}
}