site_url – Hook | Developer.WordPress.org

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

Filters the site URL.

Parameters

$urlstring: The complete site URL including scheme and path.
$pathstring: Path relative to the site URL. Blank string if no path is specified.
$schemestring|null: Scheme to give the site URL context. Accepts 'http', 'https', 'login', 'login_post', 'admin', 'relative' or null.
$blog_idint|null: Site ID, or null for the current site.

return apply_filters( 'site_url', $url, $path, $scheme, $blog_id );

Used by	Description
wp_is_site_url_using_https()`wp-includes/https-detection.php`	Checks whether the current site’s URL where WordPress is stored is using HTTPS.
get_site_url()`wp-includes/link-template.php`	Retrieves the URL for a given site where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.

Version	Description
2.7.0	Introduced.

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