wp-includes/link-template.php:3460Retrieves the URL for a given site where the front end is accessible.
$blog_idint|nulloptionalnull$pathstringoptional''$schemestring|nulloptionalnullstringOne hook fires while get_home_url() runs, in this order:
function get_home_url( $blog_id = null, $path = '', $scheme = null ) { $orig_scheme = $scheme; if ( empty( $blog_id ) || ! is_multisite() ) { $url = get_option( 'home' ); } else { switch_to_blog( $blog_id ); $url = get_option( 'home' ); restore_current_blog(); } if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ), true ) ) { if ( is_ssl() ) { $scheme = 'https'; } else { $scheme = parse_url( $url, PHP_URL_SCHEME ); } } $url = set_url_scheme( $url, $scheme ); if ( $path && is_string( $path ) ) { $url .= '/' . ltrim( $path, '/' ); } /** * Filters the home URL. * * @since 3.0.0 * * @param string $url The complete home URL including scheme and path. * @param string $path Path relative to the home URL. Blank string if no path is specified. * @param string|null $orig_scheme Scheme to give the home URL context. Accepts 'http', 'https', * 'relative', 'rest', or null. * @param int|null $blog_id Site ID, or null for the current site. */ return apply_filters( 'home_url', $url, $path, $orig_scheme, $blog_id );}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.