WP_Translation_File::create( string $file, string|null $filetype = null ): false|WP_Translation_File

84	public static function create( string $file, ?string $filetype = null ) {85		if ( ! is_readable( $file ) ) {86			return false;87		}88 89		if ( null === $filetype ) {90			$pos = strrpos( $file, '.' );91			if ( false !== $pos ) {92				$filetype = substr( $file, $pos + 1 );93			}94		}95 96		switch ( $filetype ) {97			case 'mo':98				return new WP_Translation_File_MO( $file );99			case 'php':100				return new WP_Translation_File_PHP( $file );101			default:102				return false;103		}104	}