bp_has_notifications( array|string $args = '' )

function bp_has_notifications( $args = '' ) {

	// Get the default is_new argument.
	if ( bp_is_current_action( 'unread' ) ) {
		$is_new = 1;
	} elseif ( bp_is_current_action( 'read' ) ) {
		$is_new = 0;

	// Not on a notifications page? default to fetch new notifications.
	} else {
		$is_new = 1;
	}

	// Get the user ID.
	if ( bp_displayed_user_id() ) {
		$user_id = bp_displayed_user_id();
	} else {
		$user_id = bp_loggedin_user_id();
	}

	// Set the component action (by default false to get all actions)
	$component_action = false;

	if ( isset( $_REQUEST['type'] ) ) {
		$component_action = sanitize_key( $_REQUEST['type'] );
	}

	// Set the search terms (by default an empty string to get all notifications)
	$search_terms = '';

	if ( isset( $_REQUEST['s'] ) ) {
		$search_terms = stripslashes( $_REQUEST['s'] );
	}

	// Parse the args.
	$r = bp_parse_args( $args, array(
		'id'                => false,
		'user_id'           => $user_id,
		'secondary_item_id' => false,
		'component_name'    => bp_notifications_get_registered_components(),
		'component_action'  => $component_action,
		'is_new'            => $is_new,
		'search_terms'      => $search_terms,
		'order_by'          => 'date_notified',
		'sort_order'        => 'DESC',
		'meta_query'        => false,
		'date_query'        => false,
		'page'              => 1,
		'per_page'          => 25,

		// These are additional arguments that are not available in
		// BP_Notifications_Notification::get().
		'max'               => false,
		'page_arg'          => 'npage',
	), 'has_notifications' );

	// Get the notifications.
	$query_loop = new BP_Notifications_Template( $r );

	// Setup the global query loop.
	buddypress()->notifications->query_loop = $query_loop;

	/**
	 * Filters whether or not the user has notifications to display.
	 *
	 * @since BuddyPress 1.9.0
	 * @since BuddyPress 2.6.0 Added the `$r` parameter.
	 *
	 * @param bool                      $value      Whether or not there are notifications to display.
	 * @param BP_Notifications_Template $query_loop BP_Notifications_Template object instance.
	 * @param array                     $r          Array of arguments passed into the BP_Notifications_Template class.
	 */
	return apply_filters( 'bp_has_notifications', $query_loop->has_notifications(), $query_loop, $r );
}