wp_heartbeat_settings() WordPress Function

function wp_heartbeat_settings( $settings ) {
	if ( ! is_admin() ) {
		$settings['ajaxurl'] = admin_url( 'admin-ajax.php', 'relative' );
	}

	if ( is_user_logged_in() ) {
		$settings['nonce'] = wp_create_nonce( 'heartbeat-nonce' );
	}

	return $settings;
}
Uses	Description
wp-includes/pluggable.php:wp_create_nonce()	Creates a cryptographic token tied to a specific action, user, user session, and window of time.
wp-includes/pluggable.php:is_user_logged_in()	Determines whether the current visitor is a logged in user.
wp-includes/load.php:is_admin()	Determines whether the current request is for an administrative interface page.
wp-includes/link-template.php:admin_url()	Retrieves the URL to the admin area for the current site.