Facebook授权运行到重定向循环 - Facebook Authorization runs in to a redirect loop

Facebook Authorization runs in to a redirect loop

我在文档中使用Facebook应用程序画布代码，在我点击"允许"后，它一直在重定向。不确定出了什么问题。一定要检查它是一个bug还是只有我。它来自http://developers.facebook.com/docs/appsonfacebook/tutorial/

<?php 
 $app_id = ""; //Added my app id
 $canvas_page = ""; //Added my canvas page
 $auth_url = "http://www.facebook.com/dialog/oauth?client_id=" 
        . $app_id . "&redirect_uri=" . urlencode($canvas_page);
 $signed_request = $_REQUEST["signed_request"];
 list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
 $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
 if (empty($data["user_id"])) {
        echo("<script> top.location.href='" . $auth_url . "'</script>");
 } else {
        echo ("Welcome User: " . $data["user_id"]);
 } 
?>

我的建议是使用php-Sdk，它让你的每件事都变得更容易&登录代码如下：

<?php
include_once('src/facebook.php');
$config = array(
    'appId' => 'xxxxxxxxxxxx',
    'secret' => 'xxxxxxxxxxxxxxxx',
    'fileUpload' => FALSE, // optional
  );
$canvas_page = ""; //Added my canvas page
 $auth_url = "http://www.facebook.com/dialog/oauth?client_id=" 
        . $app_id . "&redirect_uri=" . urlencode($canvas_page);
$uid=$facebook->getuser();
if(empty($uid)){ echo("<script> top.location.href='" . $auth_url . "'</script>");}
else { echo ("Welcome User: " . $uid);}