get_bloginfo

 * @since 0.71
 *
 * @see get_bloginfo() For possible `$show` values
 *
 * @param string $show Optional. Site information to display. Default empty.
 */
function bloginfo( $show = '' ) {
	echo get_bloginfo( $show, 'display' );
}

/**
 * Retrieves information about the current site.
 *
 * Possible values for `$show` include:
 *
 * - 'name' - Site title (set in Settings > General)
 * - 'description' - Site tagline (set in Settings > General)
 * - 'wpurl' - The WordPress address (URL) (set in Settings > General)
 * - 'url' - The Site address (URL) (set in Settings > General)
 * - 'admin_email' - Admin email (set in Settings > General)
 * - 'charset' - The "Encoding for pages and feeds"  (set in Settings > Reading)
 * - 'version' - The current WordPress version
 * - 'html_type' - The content-type (default: "text/html"). Themes and plugins
 *   can override the default value using the {@see 'pre_option_html_type'} filter
 * - 'text_direction' - The text direction determined by the site's language. is_rtl()
 *   should be used instead
 * - 'language' - Language code for the current site
 * - 'stylesheet_url' - URL to the stylesheet for the active theme. An active child theme
 *   will take precedence over this value
 * - 'stylesheet_directory' - Directory path for the active theme.  An active child theme
 *   will take precedence over this value
 * - 'template_url' / 'template_directory' - URL of the active theme's directory. An active
 *   child theme will NOT take precedence over this value
 * - 'pingback_url' - The pingback XML-RPC file URL (xmlrpc.php)
 * - 'atom_url' - The Atom feed URL (/feed/atom)
 * - 'rdf_url' - The RDF/RSS 1.0 feed URL (/feed/rdf)
 * - 'rss_url' - The RSS 0.92 feed URL (/feed/rss)
 * - 'rss2_url' - The RSS 2.0 feed URL (/feed)
 * - 'comments_atom_url' - The comments Atom feed URL (/comments/feed)
 * - 'comments_rss2_url' - The comments RSS 2.0 feed URL (/comments/feed)
 *
 * Some `$show` values are deprecated and will be removed in future versions.
 * These options will trigger the _deprecated_argument() function.
 *
 * Deprecated arguments include:
 *
 * - 'siteurl' - Use 'url' instead
 * - 'home' - Use 'url' instead
 *
 * @since 0.71
 *
 * @global string $wp_version The WordPress version string.
 *
 * @param string $show   Optional. Site info to retrieve. Default empty (site name).
 * @param string $filter Optional. How to filter what is retrieved. Default 'raw'.
 * @return string Mostly string values, might be empty.
 */
function get_bloginfo( $show = '', $filter = 'raw' ) {
	switch ( $show ) {
		case 'home':    // Deprecated.
		case 'siteurl': // Deprecated.
			_deprecated_argument(
				__FUNCTION__,
				'2.2.0',
				sprintf(
					/* translators: 1: 'siteurl'/'home' argument, 2: bloginfo() function name, 3: 'url' argument. */
					__( 'The %1$s option is deprecated for the family of %2$s functions. Use the %3$s option instead.' ),
					'<code>' . $show . '</code>',
					'<code>bloginfo()</code>',
					'<code>url</code>'
				)
			);
			// Intentional fall-through to be handled by the 'url' case.
		case 'url':
			$output = home_url();
			break;
		case 'wpurl':
			$output = site_url();
			break;
		case 'description':
			$output = get_option( 'blogdescription' );
			break;
		case 'rdf_url':
			$output = get_feed_link( 'rdf' );
			break;
		case 'rss_url':
			$output = get_feed_link( 'rss' );
			break;
		case 'rss2_url':
			$output = get_feed_link( 'rss2' );
			break;
		case 'atom_url':
			$output = get_feed_link( 'atom' );
			break;
		case 'comments_atom_url':
			$output = get_feed_link( 'comments_atom' );
			break;
		case 'comments_rss2_url':
			$output = get_feed_link( 'comments_rss2' );
			break;
		case 'pingback_url':
			$output = site_url( 'xmlrpc.php' );
			break;
		case 'stylesheet_url':
			$output = get_stylesheet_uri();
			break;
		case 'stylesheet_directory':
			$output = get_stylesheet_directory_uri();
			break;
		case 'template_directory':
		case 'template_url':
			$output = get_template_directory_uri();
			break;
		case 'admin_email':
			$output = get_option( 'admin_email' );
			break;
		case 'charset':
			$output = get_option( 'blog_charset' );
			if ( '' === $output ) {
				$output = 'UTF-8';
			}
			break;
		case 'html_type':
			$output = get_option( 'html_type' );
			break;
		case 'version':
			global $wp_version;
			$output = $wp_version;
			break;
		case 'language':
			/*
			 * translators: Translate this to the correct language tag for your locale,
			 * see https://www.w3.org/International/articles/language-tags/ for reference.
			 * Do not translate into your own language.
			 */
			$output = __( 'html_lang_attribute' );
			if ( 'html_lang_attribute' === $output || preg_match( '/[^a-zA-Z0-9-]/', $output ) ) {
				$output = determine_locale();
				$output = str_replace( '_', '-', $output );
			}
			break;