为什么会出现“页面无法正确重定向”错误？

Question

我是从nettuts那里得到的，有人可以告诉我为什么我收到“页面无法正确重定向”的错误吗？

<?php
# We require the library
require("facebook.php");

# Creating the facebook object
$facebook = new Facebook(array(
    'appId'  => 'APP_ID_HERE',
    'secret' => 'APP_SECRET_HERE',
    'cookie' => true
));

# Let's see if we have an active session
$session = $facebook->getUser();

if(!empty($session)) {
    # Active session, let's try getting the user id (getUser()) and user info (api->('/me'))
    try{
        $uid = $facebook->getUser();

        # req_perms is a comma separated list of the permissions needed
        $url = $facebook->getLoginUrl(array(
            'req_perms' => 'email,user_birthday,status_update,publish_stream,user_photos,user_videos'
        ));
        header("Location: $url");
    } catch (Exception $e){}
} else {
    # There's no active session, let's generate one
    $login_url = $facebook->getLoginUrl();
    header("Location: ".$login_url);
}

Answer 1

您将通过身份验证的用户重定向到$facebook->getLoginUrl(array(...)) ，从而创建一个重定向循环。

您应该只重定向未经req_perms验证的用户（使用req_perms进行的重定向应该在else子句中）。 仅当您检测到该用户未授予您所有必需的权限时，才应进行try重定向。

您可以通过调用以下方法检查授予的权限：

$perms = $facebook->api(array(
    'method' => 'fql.query',
    'query' => 'SELECT email,user_birthday,status_update,publish_stream,user_photos,user_videos FROM permissions WHERE uid=' . $facebook->getUser()
));

---

修改后的代码：

 <?php # We require the library require("facebook.php"); # Creating the facebook object $facebook = new Facebook(array( 'appId' => 'APP_ID_HERE', 'secret' => 'APP_SECRET_HERE', 'cookie' => true )); # Let's see if we have an active session $session = $facebook->getUser(); if(empty($session)) { # There's no active session, let's generate one $url = $facebook->getLoginUrl(array( 'req_perms' => 'email,user_birthday,status_update,publish_stream,user_photos,user_videos' )); header("Location: $url"); exit; } // user is logged in 

Answer 2

如果您使用的是最新的PHP SDK，则已进行了一些更改，而您要求的权限则无法正常工作。

这是更新的代码。

<?php 
# We require the library 
require("facebook.php"); 

# Creating the facebook object 
$facebook = new Facebook(array( 
    'appId'  => 'APP_ID_HERE', 
    'secret' => 'APP_SECRET_HERE', 
    'cookie' => true 
)); 

# Let's see if we have an active session 
$session = $facebook->getUser(); 

if(empty($session)) { 
    # There's no active session, let's generate one 
    $url = $facebook->getLoginUrl(array( 
        "response_type"=>"token", //Can also be "code" if you need to
        "scope" => 'email,user_birthday,status_update,publish_stream,user_photos,user_videos' ,
        "redirect_uri"=> "http://test.com" //Your app callback url
    )); 
    header("Location: $url"); 
    exit; 
} 
// user is logged in 

更多信息： http : //developers.facebook.com/docs/authentication/