How to display and insert Angular array data into PHP?

I have two questions:

Q1) How can I pass array values into PHP and echo out same values in PHP? Q2) How to insert into values into database where I array key is the name of MySQL field and array value is the data for that particular field?

My console.log shows following output:

[]
firstname: "apple"
lastname: "banana"
length: 0

But I don't get these values displayed with PHP....

I have an HTML form which displays custom fields:

<form>

            <div ng-repeat="field in fields">

               <div ng-if="field.required == 'yes'">                

                  <label>
                    {{ field.fieldlabel }}
                  </label>


                <input type = "{{ field.fieldtype }}" ng-model="values[field.fieldname]">



               </div>        

            </div>  

             <div id ="entryform-button">
                <input type="submit" class="btn-primary btn" id="save" name="submit" value = "Save" ng-click="insertTrans()">
             </div>

        </form>

And Angular controller which pass data to PHP:

$scope.values = []; 

    $scope.insertTrans = function () {

        console.log($scope.values);

        //JSON.stringify($scope.values) 

        $http.post(
            "model/Form.php",
            { 'formvalues' : $scope.values }        
        ).then (function(data) {
            alert (data.data);
        });


    }

But in PHP I have tried json_decode, splash, and try to display with var_dump, echo, print_r but unable to see the data....

<?php      

$data = json_decode(file_get_contents("php://input"));  
//$data = json_decode($_POST['formvalues'], ture);

if(count($data) > 0)  {     

    var_dump($data);
    //print_r($data['formvalues']);
    //echo $data['formvalues']; 
    //echo implode(" ", $data);
    //print_r (explode(" ",$data));

//  foreach ($data['formvalues'] as $value) {
//      echo $value;
//  }

    //  $sql= "INSERT INTO trans (  ) VALUES ( )";
    //  $conn->exec($sql);
    //  echo "Data Inserted into Database";         

}

PHP returns:

array(1) {
  ["formvalues"]=>
  array(0) {
  }
}