Send form data using AngulaJS not working

I want to insert user data into databse but I can’t send from data through
angularjs and i am new to angular. I check by print_r($_POST) in insert.php but it displays as empty array.How can i send form data using php .please help me

HTML

  <form name="form" ng-submit="signup()">
    <div class="form-group">
      <label for="Name">Name</label>
      <input type="text" class="form-control" placeholder="Enter your  name" name="name" ng-pattern="/^[a-zA-Z]*$/" required ng-model="user.name">
      <span ng-show="form.name.$dirty && form.name.$error.required">Enter  your name</span>
      <span ng-show="form.name.$dirty && form.name.$error.pattern">Name in  characters only</span>
    </div>

    <div class="form-group">
      <label for="Mobile">Mobile Number</label>
      <input type="text" class="form-control" placeholder="Enter your mobile number" name="mobile" required ng-minlength="10" ng-maxlength="10" ng-model="user.mobile">
      <span ng-show="form.mobile.$dirty &&  form.mobile.$error.required">Enter your mobile number</span>
      <span ng-show="form.mobile.$dirty && (form.mobile.$error.minlength || form.mobile.$error.maxlength)">Mobile number should be 10 digits</span>
    </div>

    <div class="form-group">
      <label for="Name">Email</label>
      <input type="email" class="form-control" placeholder="Enter your email" name="email" required ng-model="user.email">
      <span ng-show="form.email.$dirty && form.email.$error.required">Enter your email</span>
      <span ng-show="form.email.$dirty && form.email.$error.email">Enter a valid email</span>
    </div>

    <div class="form-group">
      <label for="pwd">Password</label>
      <input type="password" class="form-control" placeholder="Enter password" name="password" required ng-minlength="8" ng-model="user.password">
      <span ng-show="form.password.$dirty && form.password.$error.required">Enter your password</span>
      <span ng-show="form.password.$dirty && form.password.$error.minlength">Password should be 8 characters</span>
    </div>
      <button class="btn btn-primary btn-block" name="login" id="login_btn" ng-disabled="form.$invalid">Sign up</button>
  </form><br><br>
  <p class="text-center" id="new"><span>Already have an account</span></p>
  <a href="login.php" class="btn btn-default btn-block">Signin</a>
</div>
</div>
</body>
</html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1  /jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

JS

        var app = angular.module('MyApp', []);
        app.controller('MyCtrl', function($scope, $http) {
            $scope.signup = function(){    
                var data = $scope.user; 

                $http.post("insert.php", data).then(function(resp){

                    console.log(resp);

                });        
            }
        });

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/09/27/send-form-data-using-angulajs-not-working/
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