我没有收到带有angularJS的变量$ _POST

Question

i am starting to angularJS and i make a program to learn but i don't understand why i don't receive my $_POST variable when i sent

this my controller code

var ModalInstanceCtrl = function($scope,$http, $modalInstance, $modal, Name, Country, City) {

     $scope.Name = Name;
     $scope.City = City;
     $scope.Country = Country;



     $scope.ok = function (Name,Country,City) {

         Country = 'test';

       $http.post('requete.php', Country)
            .success(function (reponse) {
                $scope.PostDataResponse = reponse;
            })
            .error(function (status) {
           alert(status);
                $scope.ResponseDetails = "Data";
            });
      };

     $scope.cancel = function () {
        $modalInstance.dismiss('cancel');
      };
}

and this is my requete.php

<?php
header("Content-Type: application/json; charset=UTF-8");
var_dump($_POST);

echo 1;
?>

modal.html

<div class="modal-dialog">
  <div class="modal-content">
    <div class="modal-header-info">
      <button type="button" class="close" ng-click="cancel()"></button>
      <h4 class="modal-title">Envoyer un SMS</h4>
    </div>
    <div class="modal-body">
        {{PostDataResponse}}
        <div class="col-md-12">
        <spam class="spamcenter">Nom : {{Name}}</spam>
        <br>
        <spam class="spamcenter">Pays : {{Country}}</spam>
        <br>
        <spam class="spamcenter">Ville : {{City}}</spam>
        </div>

    </div>
    <div class="modal-footer">
      <button type="button" class="btn btn-default" ng-click="cancel()">Close</button>
      <button type="button" class="btn btn-primary" ng-click="ok(Name,Country,City)">Envoyer</button>
    </div>
  </div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->

and this is my response variable

<?php header("Content-Type: application/json; charset=UTF-8"); var_dump($_POST); echo 1; ?> 

It returns me all the code of my file

i don't understand why and i don't see the trace of my POST in the console network

some one can help me please

thanks in advance