当他在php网站上注销facebook应用程序时，如何让用户从facebook注销

I have the following code which runs when user clicks on logout button:

if ($_GET['m'] == 'logout'){
session_destroy();
$facebook->destroySession();
header("Location: /");

}

The user is logged out of facebook app but is still online on Facebook. How to sign out the user from facebook too? Thanks

Use php sdk of facebook and paste below code in your file

    require_once 'facebook/src/facebook.php';
    $facebook = new Facebook (array(
         'appId'  => '*****************',
         'secret' => '****************************'  
));

 $user = $facebook->getUser();
$homeurl = 'index.php';//url you want to redirect after facebook logout


if ($user) 
{
      $logoutUrl = $facebook->getLoginUrl(array('redirect_uri'=>$homeurl));
}