Javascript 如何通过facebook从用户点击登录按钮重定向到同一页面

如何从用户单击facebook的登录按钮重定向到同一页面，我的代码在主页上运行良好，如果用户从差异页面单击，则出现问题，它是重定向到主页，而不是该页面。
如何解决

// javascript sdk
<?php
    if(!$fbuser){
        $fbuser = null;
        $loginUrl = $facebook->getLoginUrl(array('redirect_uri'=>$homeurl,'scope'=>$fbPermissions));
        echo '<a href='.$loginUrl.' class="btn btn-default facebook"> <i class="fa fa-facebook modal-icons"></i> Sign In with Facebook </a>';   
    }else{
        $user_profile = $facebook->api('/me?fields=id,first_name,last_name,email,gender,locale,picture');
        $user = new FB_users();
        $user_data = $user->checkUser('facebook',$user_profile['id'],$user_profile['first_name'],$user_profile['last_name'],$user_profile['email'],$user_profile['gender'],$user_profile['locale'],$user_profile['picture']['data']['url']);
        // Add email in session & reload page

        // i have used javascript sdk in my page.
        $_SESSION['email'] = $user_profile['email']; 
        echo '<script>parent.window.location.reload(true);</script>'; 
    }
                                        ?>
    =====that my code on login page=========
    so how to do it .

//javascript sdk
====我的代码在登录页面上=========
那么怎么做呢。

试试这个

<?php
    if(!$fbuser) {
        $fbuser = null;
        $loginUrl = $facebook->getLoginUrl(array('redirect_uri'=>$homeurl,'scope'=>$fbPermissions));
        echo '<a href='.$loginUrl.' class="btn btn-default facebook"> <i class="fa fa-facebook modal-icons"></i> Sign In with Facebook </a>';   
    } else {
        $user_profile = $facebook->api('/me?fields=id,first_name,last_name,email,gender,locale,picture');
        $user = new FB_users();
        $user_data = $user->checkUser('facebook',$user_profile['id'],$user_profile['first_name'],$user_profile['last_name'],$user_profile['email'],$user_profile['gender'],$user_profile['locale'],$user_profile['picture']['data']['url']);
        // Add email in session & reload page

        // i have used javascript sdk in my page.
        $_SESSION['email'] = $user_profile['email']; 

        // do not place HTML before this line
        // filter $_SERVER['HTTP_REFERER'] for your security
        header('Location: ' . $_SERVER['HTTP_REFERER']);
    }
?>

如何添加$\u服务器['HTTP\u REFERER']）；在另一个页面中，当用户从该页面单击时..您可以在每次页面加载时将HTTP_REFERER存储在会话中。存储HTTP_REFERER后，您可以在脚本中调用它。但在这一行中，我定义了我定义的重定向_uri，如何将其更改为$loginUrl=$facebook->getLoginUrl（数组（'redirect_uri'=>$homeurl，'scope'=>$fbPermissions））；将$homeurl设置为$\u服务器['HTTP\u REFERER']。。。但我不确定，如果你必须在你的facebook应用程序中输入它。我找到了两个键，分别是“下一个”和“取消”<代码>$loginUrl=$facebook->getLoginUrl（数组（'next'=>$\u服务器['HTTP\u REFERER']，'cancel'：'http://.../cancel.php“，”scope'=>$fbPermissions））完全重定向，但会话中未出现值，即未显示注销。