apply_filters( 'wpmu_welcome_notification', int|false $blog_id, int $user_id, string $password, string $title, array $meta )

1608	 * @param int|false $blog_id  Site ID, or false to prevent the email from sending.1609	 * @param int       $user_id  User ID of the site administrator.1610	 * @param string    $password User password, or "N/A" if the user account is not new.1611	 * @param string    $title    Site title.1612	 * @param array     $meta     Signup meta data. By default, contains the requested privacy setting and lang_id.1613	 */1614	if ( ! apply_filters( 'wpmu_welcome_notification', $blog_id, $user_id, $password, $title, $meta ) ) {1615		return false;1616	}1617 1618	$user = get_userdata( $user_id );1619 1620	$switched_locale = switch_to_user_locale( $user_id );