wpmu_new_site_admin_notification( int $site_id, int $user_id ): bool

1715function wpmu_new_site_admin_notification( $site_id, $user_id ) {1716	$site  = get_site( $site_id );1717	$user  = get_userdata( $user_id );1718	$email = get_site_option( 'admin_email' );1719 1720	if ( ! $site || ! $user || ! $email ) {1721		return false;1722	}1723 1724	/**1725	 * Filters whether to send an email to the Multisite network administrator when a new site is created.1726	 *1727	 * Return false to disable sending the email.1728	 *1729	 * @since 5.6.01730	 *1731	 * @param bool    $send Whether to send the email.1732	 * @param WP_Site $site Site object of the new site.1733	 * @param WP_User $user User object of the administrator of the new site.1734	 */1735	if ( ! apply_filters( 'send_new_site_email', true, $site, $user ) ) {1736		return false;1737	}1738 1739	$switched_locale = false;1740	$network_admin   = get_user_by( 'email', $email );1741 1742	if ( $network_admin ) {1743		// If the network admin email address corresponds to a user, switch to their locale.1744		$switched_locale = switch_to_user_locale( $network_admin->ID );1745	} else {1746		// Otherwise switch to the locale of the current site.1747		$switched_locale = switch_to_locale( get_locale() );1748	}1749 1750	$subject = sprintf(1751		/* translators: New site notification email subject. %s: Network title. */1752		__( '[%s] New Site Created' ),1753		get_network()->site_name1754	);1755 1756	$message = sprintf(1757		/* translators: New site notification email. 1: User login, 2: Site URL, 3: Site title. */1758		__(1759			'New site created by %1$s1760 1761Address: %2$s1762Name: %3$s'1763		),1764		$user->user_login,1765		get_site_url( $site->id ),1766		get_blog_option( $site->id, 'blogname' )1767	);1768 1769	$header = sprintf(1770		'From: "%1$s" <%2$s>',1771		_x( 'Site Admin', 'email "From" field' ),1772		$email1773	);1774 1775	$new_site_email = array(1776		'to'      => $email,1777		'subject' => $subject,1778		'message' => $message,1779		'headers' => $header,1780	);1781 1782	/**1783	 * Filters the content of the email sent to the Multisite network administrator when a new site is created.1784	 *1785	 * Content should be formatted for transmission via wp_mail().1786	 *1787	 * @since 5.6.01788	 *1789	 * @param array $new_site_email {1790	 *     Used to build wp_mail().1791	 *1792	 *     @type string $to      The email address of the recipient.1793	 *     @type string $subject The subject of the email.1794	 *     @type string $message The content of the email.
When	Instructions	Calls it makes
always	16–18	`get_site(), get_userdata(), get_site_option()`
`!apply_filters()`	25	`get_site(), get_userdata(), get_site_option(), apply_filters()`
`apply_filters()`	110	`get_site(), get_userdata(), get_site_option(), apply_filters(), get_user_by(), get_locale(), switch_to_locale(), __(), get_network(), sprintf(), __(), get_site_url(), get_blog_option(), sprintf(), _x(), sprintf(), apply_filters(), wp_specialchars_decode(), wp_mail()`
`apply_filters()`	111	`get_site(), get_userdata(), get_site_option(), apply_filters(), get_user_by(), switch_to_user_locale(), __(), get_network(), sprintf(), __(), get_site_url(), get_blog_option(), sprintf(), _x(), sprintf(), apply_filters(), wp_specialchars_decode(), wp_mail()`
`apply_filters()`	112	`get_site(), get_userdata(), get_site_option(), apply_filters(), get_user_by(), get_locale(), switch_to_locale(), __(), get_network(), sprintf(), __(), get_site_url(), get_blog_option(), sprintf(), _x(), sprintf(), apply_filters(), wp_specialchars_decode(), wp_mail(), restore_previous_locale()`
`apply_filters()`	113	`get_site(), get_userdata(), get_site_option(), apply_filters(), get_user_by(), switch_to_user_locale(), __(), get_network(), sprintf(), __(), get_site_url(), get_blog_option(), sprintf(), _x(), sprintf(), apply_filters(), wp_specialchars_decode(), wp_mail(), restore_previous_locale()`