PHP未响应Angularjs请求

我有一张原始表格，上面有一些angularjs验证

<form name = "sform" novalidate="true">
<table border="0">
    <tr>
        <td>
            First name:
        </td>
        <td>
            <input type="text" name="fname" ng-model="fname" placeholder="First Name" required="true" ng-pattern="/^[A-Za-z]*$/">
        </td>
        <td ng-show="sform.fname.$invalid && !sform.fname.$pristine"  class="help-block">wrong name </td>
    </tr>

    <tr>
        <td>
            Last Name:
        </td>
        <td>
            <input type="text" ng-model="lname" placeholder="last Name" required="true" ng-pattern="/^[A-Za-z]*$/">
        </td>
        <td ng-show= "sform.lname.$invalid && !sform.lname.$pristine"  class="help-block">wrong Last name </td>
    </tr>
    <tr>
        <td>
            Email:
        </td>
        <td>
            <input type="email" ng-model="email" placeholder="email" required="true">
        </td>
        <td ng-show="sform.email.$invalid && !sform.email.$pristine"  class="help-block">wrong Email </td>
    </tr>
    <tr>
        <td>
            <button type="submit" ng-disabled="sform.$invalid" ng-click = "submitForm()">Submit</button>
        </td>
    </tr>       
</table>
</form>

far\u formcontroller.js

var farLogin = angular.module('far_login',[]);

farLogin.controller('far_formcontrol',['$scope','$http',function($scope,$http) {
    $scope.url='http://localhost/far_submit.php';
     var config = {
                headers : {
                    'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8;'
                }
            }

        // function to submit the form after all validation has occurred            
        $scope.submitForm = function() {
            alert('our form is amazing'+$scope.fname+' '+$scope.email+' '+$scope.lname); 
            // check to make sure the form is completely valid
            if ($scope.sform.$valid) {
                $http.post($scope.url,{"name": $scope.fname, "email": $scope.email, "lname": $scope.lname},config).
                 success(function() {
                            alert('our form is amazing'+$scope.fname+' '+$scope.email+' '+$scope.lname); 
                        })

            }
            else
            {
                alert('our form is not amazing');   
            }

        }

    }]);

我的php文件是

<?php
header("Access-Control-Allow-Origin: *");
?>
<script type="text/javascript"> alert("this is php")</script>
<?php
?>

警报（“这是php”）

但是php脚本根本没有执行，并且在浏览器的控制台中也没有错误

我错在哪里

多谢各位