facebook上的php php-graph-sdk v5错误

Question

我尝试写一个脚本facebook登录。用户php-graph-sdk v5。它在firefox上运行正常但在chrome和其他浏览器上无效。

我的登录页面index.php：

<?php session_start(); ?>
<a class="btn btn-facebook"  onclick="login_facebook();" href="javascript:void(0);">facebook login</a>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script type="text/javascript">
    window.fbAsyncInit = function() {
        FB.init({
          appId      : 'app_id', // App ID
          status     : true, // check login status
          cookie     : true, // enable cookies to allow the server to access the session
          xfbml      : true  // parse XFBML
        });
    }

    function login_facebook()
    {
        FB.login(function(response) {
           if (response.authResponse) 
           {
                FB.api('/me?fields=id,first_name,last_name,picture,email', function(response) {
                    var email = response.email;
                    if(email != '')
                    {
                    //  alert(email);
                        window.location.replace('http://localhost/testphp/call-back.php');
                    }
                });
            } else 
            {
             console.log('User cancelled login or did not fully authorize.');
            }
        },{scope: 'email,user_photos'});
    }
</script>

我的call-back.php：

<?php
session_start();
require_once('Facebook/autoload.php');
$fb = new Facebook\Facebook([
                  'app_id' => 'app_id', // Replace {app-id} with your app id
                  'app_secret' => 'app_secret',
                  'default_graph_version' => 'v2.9',
                  ]);
            $helper = $fb->getJavaScriptHelper();
try {
              $accessToken = $helper->getAccessToken();
              echo $accessToken;
            } catch(Facebook\Exceptions\FacebookResponseException $e) {
              // When Graph returns an error
              echo 'Graph returned an error: ' . $e->getMessage();
              exit;
            } catch(Facebook\Exceptions\FacebookSDKException $e) {
              // When validation fails or other local issues
              echo 'Facebook SDK returned an error: ' . $e->getMessage();
              exit;
            }

            if (! isset($accessToken)) {
              if ($helper->getError()) {
                header('HTTP/1.0 401 Unauthorized');
                echo "Error: " . $helper->getError() . "\n";
                echo "Error Code: " . $helper->getErrorCode() . "\n";
                echo "Error Reason: " . $helper->getErrorReason() . "\n";
                echo "Error Description: " . $helper->getErrorDescription() . "\n";
              } else {
                header('HTTP/1.0 400 Bad Request');
                echo 'Bad request';
              }
              exit;
            }


            // Logged in
            // The OAuth 2.0 client handler helps us manage access tokens
            $oAuth2Client = $fb->getOAuth2Client();

            // Get the access token metadata from /debug_token
            $tokenMetadata = $oAuth2Client->debugToken($accessToken);

            // Get user’s Facebook ID
            $userId = $tokenMetadata->getField('user_id');

            try {
              // Get the Facebook\GraphNodes\GraphUser object for the current user.
              // If you provided a 'default_access_token', the '{access-token}' is optional.
              $response = $fb->get('/me?fields=id,name,email,first_name,last_name', $accessToken->getValue());
            //  print_r($response);
            } catch(Facebook\Exceptions\FacebookResponseException $e) {
              // When Graph returns an error
              echo 'ERROR: Graph ' . $e->getMessage();
              exit;
            } catch(Facebook\Exceptions\FacebookSDKException $e) {
              // When validation fails or other local issues
              echo 'ERROR: validation fails ' . $e->getMessage();
              exit;
            }
            $me = $response->getGraphUser();
            //print_r($me);
            echo "Full Name: ".$me->getProperty('name')."<br>";
            echo "First Name: ".$me->getProperty('first_name')."<br>";
            echo "Last Name: ".$me->getProperty('last_name')."<br>";
            echo "Email: ".$me->getProperty('email');
            echo "Facebook ID: <a href='https://www.facebook.com/".$me->getProperty('id')."' target='_blank'>".$me->getProperty('id')."</a>";

?>

它在firefox上工作正常，但chrome和其他一些浏览器返回错误。致命错误：在第24行的call-back.php中调用未定义的方法Facebook \ Helpers \ FacebookJavaScriptHelper :: getError（）。你能否帮我解决这个错误。谢谢！