apply_filters( 'site_url', string $url, string $path, string|null $scheme, int|null $blog_id )

Parameters

$url

(string) The complete site URL including scheme and path.

$path

(string) Path relative to the site URL. Blank string if no path is specified.

$scheme

(string|null) Scheme to give the site URL context. Accepts 'http', 'https', 'login', 'login_post', 'admin', 'relative' or null.

$blog_id

(int|null) Site ID, or null for the current site.