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我正在尝试在 codeigniter 应用程序上使用 facebook 登录。我有一个登录按钮，可以让他们授予权限，然后将他们重定向到应该在数组中显示他们的 facebook 信息的页面，但是 getUser 一直返回 0，即使在我登录后也是如此。

我不知道从哪里开始寻找错误，因为这是我第一次潜入 facebook sdk

这是我的代码：

php

Facebook 连接库：

<?php include(APPPATH.'libraries/facebook/facebook.php');
class Fbconnect extends Facebook{
    public $user = null;
    public $user_id = null;
    public $fb = false;
    public $fbSession = false;
    public $appkey = 0;

    public function __construct() {
        $ci =& get_instance();
        $ci->config->load('facebook', TRUE);
        $config = $ci->config->item('facebook');
        parent::__construct($config);
        $this->user_id = $this->getUser();
        $me = null;
        if ($this->user_id) {
            try{
                $me = $this->api('/me');
                $this->user = $me;

            } catch(FacebookApiException $e) {
                error_log($e);
            }
        } else {
        }

    }

}

 ?>

我的主要功能

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Main extends CI_Controller {
    public function index()
    {
        $this->login();
    }
    public function login() {
        $this->load->library('fbconnect');

        $this->load->view('login');
    }

    public function facebook_request() {

        $this->load->library('fbconnect');
        $data = array(
            'redirect_uri' => 'http://localhost/ci_test/main/handle_facebook_login',
            'scope' => 'email'
        );
        redirect($this->fbconnect->getLoginUrl($data));
    }

    public function handle_facebook_login() {
        $this->load->library('fbconnect');
        if ($this->fbconnect->user) {
            print_r($this->fbconnect->user);
        } else
        {
            echo "Couldn't log in";
            echo "User Id";
            echo $this->fbconnect->user_id;
        }
    }
}

登录链接

<h1>Login!</h1>
    <a href='main/facebook_request'> Connect with facebook </a>
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