SDK 4.0 Facebook，没有请求权限的对话框publish_actions

我在facebook上创建了一个应用程序，并通过PHP SDK 4.0创建了登录名，我需要在订阅源上拥有写权限，但即使我们已经添加了权限，当我不登录时，更多的窗口框可以批准和授予权限。

这是使用的代码：

<?php session_start(); 
require 'Facebook/autoload.php'; 


use Facebook'FacebookSession; 
use Facebook'FacebookRequest;
use Facebook'GraphObject;
use Facebook'FacebookRequestException;
use Facebook'FacebookRedirectLoginHelper;

// init app with app id (APPID) and secret (SECRET)
FacebookSession::setDefaultApplication('XXXXXXXXXX XXXXXXXX','XXXXXXXXXXXXXXXXXX');
// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper( 'XXXXXXXXXXXXX' );
try {
$session = $helper->getSessionFromRedirect();
} catch( FacebookRequestException $ex ) {
// When Facebook returns an error
} catch( Exception $ex ) {
// When validation fails or other local issues
}
// see if we have a session
if ( isset( $session ) ) {
// graph api request for user data
$request = new FacebookRequest( $session, 'GET', '/me' );
$response = $request->execute();
// get response
$graphObject = $response->getGraphObject();
// print data
echo print_r( $graphObject, 1 );



if($session) {

try {

$response = (new FacebookRequest(
$session, 'POST', '/me/feed', array(
'link' => 'www.example.com',
'message' => 'User provided message'
)
))->execute()->getGraphObject();

echo "Posted with id: " . $response->getProperty('id');

} catch(FacebookRequestException $e) {

echo "Exception occured, code: " . $e->getCode();
echo " with message: " . $e->getMessage();

} 

}


} else {
$params = array(
scope => 'publish_actions'
//redirect_uri => $url
);
// show login url
echo '<a href="' . $helper->getLoginUrl($params) . '">Login</a>';
}
?>