Question

我关注http://benmarshall.me/facebook-sdk-php-v4-codeigniter/ 教程。在这里我可以获得登录URL但我无法获得注销网址任何人都可以告诉我为什么我没有得到这个

这是我的facebook libaray注销功能

 public function logout_url() {
        $_session = $this->helper->getSessionFromRedirect();
        $session = new FacebookSession( $_session->getToken() );
        $next_url = 'http://localhost/ci_sdk/index.php/welcome/login';
        return $this->helper->getLogoutUrl($session,$next_url);         
      }

这是我在facebook库中的构造函数

  public function __construct() {
    $this->ci =& get_instance();
    $this->permissions = $this->ci->config->item('permissions', 'facebook');

    FacebookSession::setDefaultApplication( $this->ci->config->item('api_id', 'facebook'), $this->ci->config->item('app_secret', 'facebook') );


    $this->helper = new FacebookRedirectLoginHelper( $this->ci->config->item('redirect_url', 'facebook') );

    if ( $this->ci->session->userdata('fb_token') ) {
      $this->session = new FacebookSession( $this->ci->session->userdata('fb_token') );

      try {
        if ( ! $this->session->validate() ) {
          $this->session = null;
        }
      } catch ( Exception $e ) {
        // Catch any exceptions
        $this->session = null;
      }
    } else {

      try {
        $this->session = $this->helper->getSessionFromRedirect();
      } catch( FacebookRequestException $ex ) {

      } catch( Exception $ex ) {

      }
    }

    if ( $this->session ) {
      $this->ci->session->set_userdata( 'fb_token', $this->session->getToken() );

      $this->session = new FacebookSession( $this->session->getToken() );

       $this->logoutURL = $this->helper->getLogoutUrl( $this->session, 'http://localhost/ci_sdk/index.php/welcome/login' );
    }
  }

这是我的控制器功能

public function logout()
    {
        $this->load->library('facebook');
        $logout_url = $this->facebook->logout_url();
        echo '<a href="' . $logout_url . '">logout</a>';

    }

它给了我这个错误

Fatal error: Call to a member function getToken() on null in E:\xammp\htdocs\ci_sdk\application\libraries\facebook\facebook.php

我是CodeIgniter的新手，所以请帮助我。提前致谢

getLogoutUrl使用facebook图api php CodeIgniter

0 个答案: