Facebook Fan Page Wall Post from website using php sdk returning code parameter - facebook

Question

I try to post facebook fan page wall from my website using php sdk 3.0.Its Working fine
Sometimes the redirecturl contains Code parameter and stopped all process.
The url look like www.mysite.com/posttofacebook.php?code='somerandomstring'
i am searching lot of times but i cant get correct solution.I have mention my complete code below.
Pls help me.
Thanks.
<?php
require_once 'src/facebook.php';
// configuration
$appid = 'myappid';
$appsecret = 'myappsecret';
$pageId = 'mypageid';
$msg ='Test ';
$title = 'TestTestTestTestTestTest';
$uri = 'http://www.welcome.com';
$desc = 'TestTestTestTestTestTestTestTestTestTestTest';
$pic = 'http://www.welcome.com';
$facebook = new Facebook(array(
'appId' => $appid,
'secret' => $appsecret,
'cookie' => false,
));
$user = $facebook->getUser();
if ($user)
{
try
{
$page_info = $facebook->api("/$pageId?fields=access_token");
if (!empty($page_info['access_token'])) {
$attachment = array(
'access_token' => $page_info['access_token'],
'message' => $msg,
'name' => $title,
'link' => $uri,
'description' => $desc,
'caption' => $caption,
'picture'=>$pic,
);
$status = $facebook->api("/$pageId/feed", "post", $attachment);
$msg="<h2 align='center'>Sucessfully Posted On Facebook Wall</h2>";
}
else
{
$status = 'No access token recieved';
}
}
catch (FacebookApiException $e)
{
error_log($e);
$user = null;
}
}
else
{
header("Location:{$facebook->getLoginUrl(array('scope' =>
'photo_upload,user_status,publish_stream,user_photos,manage_pages'))}");
}
?>