get_language_attributes( string $doctype = 'html' ): string

4539function get_language_attributes( $doctype = 'html' ) {4540	$attributes = array();4541 4542	if ( function_exists( 'is_rtl' ) && is_rtl() ) {4543		$attributes[] = 'dir="rtl"';4544	}4545 4546	$lang = get_bloginfo( 'language' );4547	if ( $lang ) {4548		if ( 'text/html' === get_option( 'html_type' ) || 'html' === $doctype ) {4549			$attributes[] = 'lang="' . esc_attr( $lang ) . '"';4550		}4551 4552		if ( 'text/html' !== get_option( 'html_type' ) || 'xhtml' === $doctype ) {4553			$attributes[] = 'xml:lang="' . esc_attr( $lang ) . '"';4554		}4555	}4556 4557	$output = implode( ' ', $attributes );4558 4559	/**4560	 * Filters the language attributes for display in the 'html' tag.4561	 *4562	 * @since 2.5.04563	 * @since 4.3.0 Added the `$doctype` parameter.4564	 *4565	 * @param string $output A space-separated list of language attributes.4566	 * @param string $doctype The type of HTML document (xhtml|html).4567	 */4568	return apply_filters( 'language_attributes', $output, $doctype );4569}