How to correctly pass a variable between controllers in AngularJs via $rootScope.$broadcast?

Question

Angular

Tell me how to correctly pass a variable to AngularJs via $rootScope.$broadcast?

I try like this:

.controller('ctrl1', function($scope, $rootScope) {
        // ...
        $scope.funEvent = function(id) {
            $rootScope.$broadcast("results", id);
        };
    })

.controller('ctrl2', function($scope, $rootScope) {
        $rootScope.$on("results", function(event, id) {
            $scope.results = id;
            console.log(id);
        });
    });

The result works, but strange. it turns out on the first click, console.log does not display anything at all, on the second click it displays the correct ID, on the third click it also displays the correct ID, but already 2 times, on the fourth it displays three times, and so on. tell me how to solve this bug