Facebook login PHP SKD

任务：从我的网站成功登录Facebook，返回用户ID，最终返回电子邮件等，以添加到我的数据库数据库中。

我从 developers.facebook.com 下载了最新的 4.0.0 SKD PHP，并将其上传到我的文件管理器。

我正在使用在GitHub上找到的代码：http://packetcode.com/rd/6e20a9

请参阅下面的代码index.php

<?
/* INCLUSION OF LIBRARY FILEs*/
    require_once( 'lib/Facebook/FacebookSession.php');
    require_once( 'lib/Facebook/FacebookRequest.php' );
    require_once( 'lib/Facebook/FacebookResponse.php' );
    require_once( 'lib/Facebook/FacebookSDKException.php' );
    require_once( 'lib/Facebook/FacebookRequestException.php' );
    require_once( 'lib/Facebook/FacebookRedirectLoginHelper.php');
    require_once( 'lib/Facebook/FacebookAuthorizationException.php' );
    require_once( 'lib/Facebook/GraphObject.php' );
    require_once( 'lib/Facebook/GraphUser.php' );
    require_once( 'lib/Facebook/GraphSessionInfo.php' );
    require_once( 'lib/Facebook/Entities/AccessToken.php');
    require_once( 'lib/Facebook/HttpClients/FacebookCurl.php' );
    require_once( 'lib/Facebook/HttpClients/FacebookHttpable.php');
    require_once( 'lib/Facebook/HttpClients/FacebookCurlHttpClient.php');

/* USE NAMESPACES */
    use Facebook'FacebookSession;
    use Facebook'FacebookRedirectLoginHelper;
    use Facebook'FacebookRequest;
    use Facebook'FacebookResponse;
    use Facebook'FacebookSDKException;
    use Facebook'FacebookRequestException;
    use Facebook'FacebookAuthorizationException;
    use Facebook'GraphObject;
    use Facebook'GraphUser;
    use Facebook'GraphSessionInfo;
    use Facebook'FacebookHttpable;
    use Facebook'FacebookCurlHttpClient;
    use Facebook'FacebookCurl;
/*PROCESS*/
    //1.Stat Session
     session_start();
     //2.Use app id,secret and redirect url 
    $app_id = 'my id';
     $app_secret = 'my secret';
     $redirect_url='my url';
     //3.Initialize application, create helper object and get fb sess
     FacebookSession::setDefaultApplication($app_id,$app_secret);
     $helper = new FacebookRedirectLoginHelper($redirect_url);
     $sess = $helper->getSessionFromRedirect();
    //4. if fb sess exists echo name 
        if(isset($sess)){
            //create request object,execute and capture response
        $request = new FacebookRequest($sess, 'GET', '/me');
        // from response get graph object
        $response = $request->execute();
        $graph = $response->getGraphObject(GraphUser::className());
        // use graph object methods to get user details
        $name= $graph->getName();
        echo "hi $name";
    }else{
        //else echo login
        echo '<a href='.$helper->getLoginUrl().'>Login with facebook</a>';
    }
    ?>

我已经一点一点地复制了视频教程，当他这样做时它会起作用，所以我不知道我做错了什么。

使用facebook登录"链接时，它将我带到Facebook，请求许可，我单击"立即播放"，然后将我重定向回我的URL，但是出现以下错误。

现在，每次我单击"使用Facebook登录"链接时，它都会直接将我带到错误。

Fatal error: Uncaught exception 'Facebook'FacebookAuthorizationException' with message 'Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request' in /home/*****/public_html/lib/Facebook/FacebookRequestException.php:104 Stack trace: #0 /home/*****/public_html/lib/Facebook/FacebookRequest.php(268): Facebook'FacebookRequestException::create('{"error":{"mess...', Object(stdClass), 400) #1 /home/****/public_html/lib/Facebook/FacebookRedirectLoginHelper.php(146): Facebook'FacebookRequest->execute() #2 /home/*****/public_html/index.php(48): Facebook'FacebookRedirectLoginHelper->getSessionFromRedirect() #3 {main} thrown in /home/*****/public_html/lib/Facebook/FacebookRequestException.php on line 104

在这里和谷歌上看了之后，我似乎无法找出此错误的原因以及如何解决它。