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

1654	 * @param int|false $blog_id  Site ID, or false to prevent the email from sending.1655	 * @param int       $user_id  User ID of the site administrator.1656	 * @param string    $password User password, or "N/A" if the user account is not new.1657	 * @param string    $title    Site title.1658	 * @param array     $meta     Signup meta data. By default, contains the requested privacy setting and lang_id.1659	 */1660	if ( ! apply_filters( 'wpmu_welcome_notification', $blog_id, $user_id, $password, $title, $meta ) ) {1661		return false;1662	}1663 1664	$user = get_userdata( $user_id );1665 1666	$switched_locale = switch_to_user_locale( $user_id );