How to get data object in php?

I'm passing an angle object to php, but php insisted and "telling" that the data that is coming is not an object, what should I do? How can I get this data in php?

Follow my codes

angular:

angular.module('app.controllers', [])

.controller('logradouroCtrl', function ($scope, $http, $window) {
var pegaMsgsLogra = function () {
    idCep = $window.localStorage.getItem('idCep');
    idUsuario = $window.localStorage.getItem('idUsuario');
    var dados = {
        idUsuario: $window.localStorage.getItem('idUsuario'),
        idCep: $window.localStorage.getItem('idCep')
    }
    console.log(dados);
    $http.get("http://localhost:8888/sistemas/sistemas_web/ionic/vcApp/www/php/pegaMsgsLogra.php", dados).success(function (data){
        console.log(data);
    });
}

pegaMsgsLogra();

php:

<?php
ini_set('display_errors', true);
error_reporting(E_ALL);

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type,X-Prototype-Version,X-Requested-With');

include_once("conPDO.php");

$pdo = conectar();

$data = file_get_contents("php://input");
$data = json_decode($data);
print_r($data);
$idUsuario = $data->idUsuario;
$idCep = $data->idCep;

echo 'id usuario '.$idUsuario.' id cep '.$idCep;
?>

I put the console.log (date) and print_r (date) to see what's going on in php Here is the image: