會話變量不工作後重定向Facebook頁面

Question

這裏是我下面的代碼上facebook時間線上傳圖像，但我有問題$ _SESSION變量不保留重定向形式Facebook後的商店價值。

<?php 
session_start(); 
require 'facebook.php'; 

echo $_SESSION['uploadimage'] = $_POST['img_url']; 
echo $_SESSION['return_url'] = $_POST['return_url']; 


//die(); if I remove comment from die() function then session variable echo 

// Create our Application instance (replace this with your appId and secret). 
$facebook  = new Facebook(array(
    'appId' => 'xxxxxxxxxxx', 
    'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' 
)); 
// Get User ID 
$user   = $facebook->getUser(); 
$_SESSION['id'] = $user; 
$loginUrl  = $facebook->getLoginUrl(); 
//$_SESSION['id']; 
?> 
<?php 
// Login or logout url will be needed depending on current user state. 
if (isset($_GET['upload'])) { 
    echo "yes"; 
    if ($_SESSION['id']) { 
     $facebook->setFileUploadSupport(true); 
     $args = array(
      'message' => 'by http://thecodedeveloper.com' 
     ); 
     copy($_SESSION['uploadimage'], 'tmp/file.jpeg'); 
     $args['image'] = '@' . realpath('tmp/file.jpeg'); 
     $data   = $facebook->api('/me/photos', 'post', $args); 
     unlink('tmp/file.jpeg'); 
     //assigning users to tag and cordinates 
     $argstag  = array(
      'to' => $user 
     ); 
     $argstag['x'] = 40; 
     $argstag['y'] = 40; 
     $datatag  = $facebook->api('/' . $data['id'] . '/tags', 'post', $argstag); 
     // echo 'Success! Check your facebook wall now'; 
     header("Location:" . $_SESSION['return_url']); 

    } else { 
     header('Location:' . $loginUrl . '&scope=user_photos,publish_stream'); 
    } 
} 
?> 

Answer 1

對你的PHP代碼頂部添加session_start();。

<?php 
session_start(); //<-- Here 

require 'facebook.php'; 

Answer 2

ob_start（）;
session_start（）;
需要'facebook.php';
$ img_url = isset（$ _ POST ['img_url']）？$ _ POST ['img_url']：'';
$ return_url = isset（$ _ POST ['return_url']）？$ _ POST ['return_url']：''; ！
如果（空（$ img_url）{
回聲$ _SESSION [ 'uploadimage'] = $ img_url;
}！
如果（空（$ return_url））{
回聲$ _SESSION [ 'return_url'] = $ return_url;
}