php – 在Google OpenId中实施强制注销

我试过下面的代码,但是我无法使用openId获得强制注销的实际解决方案.

如何在Google OpenId中注销当前登录会话？

<?php

session_start();
if (isset($_SESSION['id'])) 
{
    // Redirection to login page.
    header("location: home.php");
}

if (array_key_exists("login",$_GET)) {
    $oauth_provider = $_GET['oauth_provider'];
    if ($oauth_provider == 'google') {

     $url='https://www.google.com/accounts/Logout';

  //After clearing a session it is redirected to  login-google.php

    $redirectUrl="login-google.php";

    $redirectUrl = '&return='.$redirectUrl;

    $finalUrl = $url . $redirectUrl;

   echo("<script>top.location.href='".$finalUrl."'</script>");

    } 
}
?>