February 12, 2011 
Definition:
function get_site_url( $blog_id = null, $path = '', $scheme = null ) {}
Retrieve the site url for a given site.
Returns the ‘site_url’ option with the appropriate protocol, ‘https’ if is_ssl() and ‘http’ otherwise. If $scheme is ‘http’ or ‘https’, is_ssl() is overridden.
Parameters
- int $blog_id: (optional) Blog ID. Defaults to current blog.
- string $path: Optional. Path relative to the site url.
- string $scheme: Optional. Scheme to give the site url context. Currently ‘http’, ‘https’, ‘login’, ‘login_post’, or ‘admin’.
Return values
returns:Site url link with optional path appended.
Source code
function get_site_url( $blog_id = null, $path = '', $scheme = null ) {
// should the list of allowed schemes be maintained elsewhere?
$orig_scheme = $scheme;
if ( !in_array( $scheme, array( 'http', 'https' ) ) ) {
if ( ( 'login_post' == $scheme || 'rpc' == $scheme ) && ( force_ssl_login() || force_ssl_admin() ) )
$scheme = 'https';
elseif ( ( 'login' == $scheme ) && force_ssl_admin() )
$scheme = 'https';
elseif ( ( 'admin' == $scheme ) && force_ssl_admin() )
$scheme = 'https';
else
$scheme = ( is_ssl() ? 'https' : 'http' );
}
if ( empty( $blog_id ) || !is_multisite() )
$url = get_option( 'siteurl' );
else
$url = get_blog_option( $blog_id, 'siteurl' );
if ( 'http' != $scheme )
$url = str_replace( 'http://', "{$scheme}://", $url );
1701
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