wp_privacy_anonymize_ip( string $ip_addr, bool $ipv6_fallback = false ): string

Source

	 * @param string $old_email The old site admin email address.
	 * @param string $new_email The new site admin email address.
	 */
	$email_change_email = apply_filters( 'site_admin_email_change_email', $email_change_email, $old_email, $new_email );

	$email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###SITENAME###', $site_name, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );

	wp_mail(
		$email_change_email['to'],
		sprintf(
			$email_change_email['subject'],
			$site_name
		),
		$email_change_email['message'],
		$email_change_email['headers']
	);
}

/**
 * Returns an anonymized IPv4 or IPv6 address.
 *
 * @since 4.9.6 Abstracted from `WP_Community_Events::get_unsafe_client_ip()`.
 *
 * @param string $ip_addr       The IPv4 or IPv6 address to be anonymized.
 * @param bool   $ipv6_fallback Optional. Whether to return the original IPv6 address if the needed functions
 *                              to anonymize it are not present. Default false, return `::` (unspecified address).
 * @return string  The anonymized IP address.
 */
function wp_privacy_anonymize_ip( $ip_addr, $ipv6_fallback = false ) {
	if ( empty( $ip_addr ) ) {
		return '0.0.0.0';
	}

	// Detect what kind of IP address this is.
	$ip_prefix = '';
	$is_ipv6   = substr_count( $ip_addr, ':' ) > 1;
	$is_ipv4   = ( 3 === substr_count( $ip_addr, '.' ) );

	if ( $is_ipv6 && $is_ipv4 ) {
		// IPv6 compatibility mode, temporarily strip the IPv6 part, and treat it like IPv4.
		$ip_prefix = '::ffff:';
		$ip_addr   = preg_replace( '/^\[?[0-9a-f:]*:/i', '', $ip_addr );
		$ip_addr   = str_replace( ']', '', $ip_addr );
		$is_ipv6   = false;
	}

	if ( $is_ipv6 ) {
		// IPv6 addresses will always be enclosed in [] if there's a port.
		$left_bracket  = strpos( $ip_addr, '[' );
		$right_bracket = strpos( $ip_addr, ']' );
		$percent       = strpos( $ip_addr, '%' );
		$netmask       = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';

		// Strip the port (and [] from IPv6 addresses), if they exist.
		if ( false !== $left_bracket && false !== $right_bracket ) {
			$ip_addr = substr( $ip_addr, $left_bracket + 1, $right_bracket - $left_bracket - 1 );
		} elseif ( false !== $left_bracket || false !== $right_bracket ) {
			// The IP has one bracket, but not both, so it's malformed.
			return '::';
		}

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