WordPress at a glance
filter is not described

update_welcome_subject filter-hook . WP 3.0.0

Filters the subject of the welcome email after site activation.

Usage

add_filter( 'update_welcome_subject', 'filter_function_name_7946' );
function filter_function_name_7946( $subject ){
	// filter...

	return $subject;
}
$subject(string)
Subject of the email.

Changelog

Since 3.0.0 Introduced.

Where the hook is called

wpmu_welcome_notification()
update_welcome_subject
wp-includes/ms-functions.php 1612
$subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) );

Where the hook is used (in WP core)

Usage not found!