How to access json array

I'm getting google response in json format. when I decode and print the output it works perfectly. Like this-> print_r($output);

But when I trying to access the single parameter of the array it's not working. print_r($output->results[0]->geometry->location->lat); It gives this error. "message": "Undefined offset: 0",

 public function mapdata(Request $request){
        $address = $request->name;

        $formattedAddress = str_replace(' ','+',$address);
        $response = file_get_contents('https://maps.googleapis.com/maps/api/geocode/json?address='.$formattedAddress.'&sensor=true_or_false&key=AIzaSyC8retyF0d5v2jP-H6fdffd-og'); 
        $output = json_decode($response);
        //print_r($output);
        print_r($output->results[0]->geometry->location->lat);
}

via Chebli Mohamed