Question

我想在我的网站按钮中onclick将在用户Facebook墙上发布消息。我从我网站上的php页面调用一个AJAX脚本，该脚本使用facebook代码将_POST中的消息发送到php文件。

我在运行我的php文件时遇到此错误：

警告：session_start（）[function.session-start]：无法发送会话缓存限制器 - 已发送的标头（输出始于 /home/user/public_html/fb/index.php:1)in 第49行/home/user/public_html/fb/facebook.php

我的PHP看起来像这样：

<?php
include('../ilink.php'); //mysqli connection

$fb_message=$_POST['fb_message'];
$fb_description=$_POST['fb_description'];
$fb_picture=$_POST['fb_picture'];


require 'facebook.php';

// Create our Application instance.
$facebook = new Facebook(array(
    'appId'  => '--appid--',
    'secret' => '--secret--',
    'cookie' => true
));

    $user  = $facebook->getUser(); 

    if ($user) {
      try {
        // Proceed knowing you have a logged in user who's authenticated.
        $user_profile = $facebook->api('/me');
      } catch (FacebookApiException $e) {
        error_log($e);
        $user = null;
      }
    }

    // Login or logout url will be needed depending on current user state.
    if ($user) {
      $logoutUrl = $facebook->getLogoutUrl();
    } else {
      $loginUrl = $facebook->getLoginUrl();
    }

    $attachment = array('message' => $fb_message,
            'name' => 'text',
            'caption' => 'text',
            'link' => 'http://www.domain.com',
            'description' => $fb_description,
            'picture' => $fb_picture,
            'actions' => array(array('name'=>'text', 
                              'link' => 'http://www.domain.com'),)
            );

    $result = $facebook->api('/me/feed/','post',$attachment);
?>

我的ajax脚本：

    function fb_post(fb_message,fb_description,fb_picture,redirect){
        var xmlhttp;
        if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
          xmlhttp=new XMLHttpRequest();
        }
        else{// code for IE6, IE5
          xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function(){
          if (xmlhttp.readyState==4 && xmlhttp.status==200){

                document.location.href =redirect;               
          }
        }

        var q="fb_message="+fb_message+"&fb_description="+fb_description+"&fb_picture="+fb_picture;
        xmlhttp.open("POST","/fb/index.php",true);
        xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xmlhttp.send(q);
}

为何出现错误？

Answer 1

如果这是您的所有代码，它看起来像是在会话实例之前在包含文件中发送的标题。

关于Facebook PHP SDK会话的问题

1 个答案: