How do I set angular variable to value of query string?

You can access GET parameters (URL parameters) through $routeParams:

app.controller('CtrlName', ['$scope','$routeParams', function($scope, $routeParams) {
  $scope.feature1 = $routeParams.feature1;
  $scope.feature2 = $routeParams.feature2;
}]);

Assuming your web entrypoint is a php page (or any other serverside rendered html page, such as a ASP.NET MVC View), the way I usually get values like these from the server into angular is using the constant function, and place it in the .php page right after you reference your angular app. Something like this:

<script src="app.js" />
<script>
    angular
        .module('app')
        .constant("myConfig", {
            "feature1": "<?php echo htmlspecialchars($_POST['feature1']); ?>",
            "feature2": "<?php echo htmlspecialchars($_POST['feature2']); ?>"
        });
</script>

Then in your controller, you just inject the constant: app.controller('Controller', ['myConfig', function(myConfig) {..}

While there are more convenient ways than this, when you're passing query strings (that can be accesses by JavaScript), with this approach you can pretty much pass in anything from server side code.