WordPress at a glance
filter is not described

network_site_url filter-hook . WP 3.0.0

Filters the network site URL.


add_filter( 'network_site_url', 'filter_function_name_9119', 10, 3 );
function filter_function_name_9119( $url, $path, $scheme ){
	// filter...

	return $url;
The complete network site URL including scheme and path.
Path relative to the network site URL. Blank string if no path is specified.
Scheme to give the URL context. Accepts 'http', 'https', 'relative' or null.


Since 3.0.0 Introduced.

Where the hook is called

wp-includes/link-template.php 3391
return apply_filters( 'network_site_url', $url, $path, $scheme );

Where the hook is used (in WP core)

Usage not found!