如果只登录facebook php sdk，请获取Facebook用户

Question

I want to get current loggedin facebook user in php sdk. Here is what i have tried:

$facebook = new \Facebook(array(
        'appId' => 'XXXXXXXXXXX',
        'secret' => 'XXXXXXXXXXXXXXXXXXXXX',
    ));
$user = $facebook->getUser();
var_dump($user);
if ($user) {
   $logoutUrl = $facebook->getLogoutUrl();
   echo $logoutUrl;
} else {
   $loginUrl = $facebook->getLoginUrl();
   echo $loginUrl;
}

When I load the page with above code, I get the loginUrl even though I am logged in facebook. Only when i load $loginUrl in the browser, I am able to get facebook user.

How do I get the current user at first load of this page?

Answer 1

I get the loginUrl even though I am logged in facebook.

Of course you do – being logged in to facebook.com is something completely different than being logged in to your app.

Only when i load $loginUrl in the browser, I am able to get facebook user.

That’s because after that the user is logged in to your application.

How do I get the current user at first load of this page?

Only possible for users who have connected to your app already at some point before, by using the JavaScript SDK.