HTTP 请求失败！HTTP/1.0 403 禁止

我在 6 个月前为一个网站创建了一个商店查找器，数据存储在数据库中。用户输入他们的邮政编码，当您单击搜索时，他们会列出离他们最近的商店。

当我今天早上测试实时站点时，我收到php错误消息：

A PHP Error was encountered
Severity: Warning
Message: file_get_contents(http://maps.google.co.uk/maps/geo?q=sr3+4as&output=json&key=----MYKEY---): failed to open stream: HTTP request failed! HTTP/1.0 403 Forbidden
Filename: controllers/store.php

当我在暂存站点和我的本地主机尝试此操作时，我得到了相同的响应！现在我已经 6 个月没有接触代码了，所以我假设我的密钥已过期或损坏。我创建了一个新的 API 密钥，并将其添加到我的标头和控制器中，它说错误是 - 没有运气。

我哪里做错了？！有什么东西正在停止请求并确定问题出在哪里？

这是我的控制器和代码：

class Store extends CI_Controller {
    function __construct() {
        parent::__construct();
        $this->load->model('store_model');
        $this->load->library('form_validation');
    }
    public function index(){
        $data['page_title'] = "Store Finder";
        $data['section_no'] = 5;
        $data['content'] = "store";
         function formatBritishPostcode($postcode) {    
            //--------------------------------------------------
            // Clean up the user input
            $postcode = strtoupper($postcode);
            $postcode = preg_replace('/[^A-Z0-9]/', '', $postcode);
            $postcode = preg_replace('/([A-Z0-9]{3})$/', ' '1', $postcode);
            $postcode = trim($postcode);
            //--------------------------------------------------
            // Check that the submitted value is a valid
            // British postcode: AN NAA | ANN NAA | AAN NAA |
            // AANN NAA | ANA NAA | AANA NAA
            if (preg_match('/^[a-z]('d[a-z'd]?|[a-z]'d[a-z'd]?) 'd[a-z]{2}$/i', $postcode)) {
                return $postcode;
            } else {
                return NULL;
            }       
        } 
        $this->form_validation->set_rules('postcode','Postcode','required|trim|htmlspecialchars|xssclean'); 
        $this->form_validation->set_error_delimiters('<div id="errors">&bull;&nbsp;','</div>');
        if($this->form_validation->run() == FALSE) {
            $data['error'] = 1;
            if($this->input->post('submit')) {
                $data['error_msg'] = "Please enter a Post Code.";   
            }
        } else {
            $data['error'] = 0;
            if($this->input->post('postcode')) {
                $postCodeClean = formatBritishPostcode($this->input->post('postcode'));
                if ($postCodeClean === NULL) {
                    $data['error_msg'] = "Please supply a valid Post Code.";
                } else {
                $url = "http://maps.google.co.uk/maps/geo?q=".urlencode($this->input->post('postcode'))."&output=json&key=---MYKEY---";
                    $json = file_get_contents($url);
                    $store_data = json_decode(str_replace("&quot;","'"",htmlentities($json)));
                    $lng = $store_data->Placemark[0]->Point->coordinates[0];            
                    $lat = $store_data->Placemark[0]->Point->coordinates[1];
                    $data['stores'] = $this->store_model->get_stores($lat, $lng);
                }
            }
        }
        $this->load->view('template', $data);
    }
}