位于0的JSON中的意外标记o

Question

我想使用IONIC AngularJS将数据插入MYSQL。但是我收到错误“在位置0的JSON中出现了意外的令牌o”

这是app.php的控制器

app.controller('BookingCtrl', function($scope, $http) {
$scope.bookingSave = function(){
     $http({
      method: 'post',
      url: "http://localhost/test/insertDB.php",
      data: {
                'name' : $scope.nameuser,
                'email' : $scope.email,
                'phone': $scope.phone,
                'type' : 'save_user' 
            },
      headers: {'Content-Type': 'application/x-www-form-urlencoded'}
    })
    .success(function(data,status,headers,config){
        console.log("Data Inserted Successfully");
    })
    }
});

然后这是insertDB.php

require_once 'conn.php';
$data = json_decode(file_get_contents("php://input"));

$name = $conn->real_escape_string($data->nameuser);
$email = $conn->real_escape_string($data->email);
$phone = $conn->real_escape_string($data->phone);

请帮帮我