WordPress Code Reference

site_url

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Filters the site URL.

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

$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.

Changelog
Version	Description
2.7.0	Introduced.