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需要帮助下面是我的应用程序的index.php的代码,我想在用户使用OFFLINE_ACCESS和publish_stram授权我的应用程序后在用户墙上发布

<?php 

 $app_id = "XXXXXXXXXX";

 $app_secret = "XXXXXXX";

 $canvas_page = "http://apps.facebook.com/esccounsel/";

 $auth_url = "http://www.facebook.com/dialog/oauth?client_id=" 
        . $app_id . "&redirect_uri=" . urlencode($canvas_page) . ("&scope=read_stream publish_stream offline_access");

 $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"]);
 } 

?>

我想直接在用户墙上发帖请回答