<?php
session_start();

//included file and use

$app_id = 'xxx';
$app_secret = 'xxx';
FacebookSession::setDefaultApplication($app_id, $app_secret);
$helper = new FacebookRedirectLoginHelper("`http://example/facebook4.0`/", $app_id, $app_secret);
try 
{
    $session = $helper->getSessionFromRedirect();
}
catch(FacebookRequestException $ex) { } 
catch(Exception $ex) { }

$loggedIn = false;

if (isset($session))
{
    if ($session) 
        {
            $loggedIn = true;
            try {                     //logged here and get data
                $user_profile = (new FacebookRequest(
                $session, 'GET', '/me'
                ))->execute()->getGraphObject(GraphUser::className());

               print_r($user_profile); //print data

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

if(!$loggedIn)  //if user is not online // get link and add scope
{
    $loginUrl = $helper->getLoginUrl(array('public_profile','email'));
    echo "<a href='$loginUrl'>Login With Facebook</a>";
}
else
{
    print_r($user_profile); //logout link is generated here 
    echo '<br><br><a href="index.php">Logout</a>'; //print to sceen
}

?>

Ich habe den Domainnamen auf localhost und die Site-URL auf gesetzthttp://localhost/. Ich habe es auch versuchthttp://localhost:80 , http://mydomainname:80 (Hosts wechseln)

Dies ist ein Fehler, den ich als Antwort bekomme:

Facebook\FacebookSDKException Object
(
    [message:protected] => Failed to connect to graph.facebook.com port 443: Network unreachable
    [string:Exception:private] => 
    [code:protected] => 7
    [file:protected] => C:\xampp\htdocs\myapp\Facebook\HttpClients\FacebookCurlHttpClient.php
    [line:protected] => 142
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => C:\xampp\htdocs\myapp\Facebook\FacebookRequest.php
                    [line] => 248
                    [function] => send
                    [class] => Facebook\HttpClients\FacebookCurlHttpClient
                    [type] => ->
                    [args] => Array
                        (
                            [0] => https://graph.facebook.com/v2.0/oauth/access_token?client_id='my key'&redirect_uri=http%3A%2F%2Flocalhost%3A80%2Fmyapp%2F&client_secret='mykey_secert'&code=AQCYmzsFNUIQG7gUAZ3y-YJHLeIGcF-xyqHotx31MCJGlm16fV9VbVSzlGlx5280-u0Ho3jFjg_REevN5J0LEIPHerY1QaaBYjpkkoIMf6PCwHGj2OIrQDvfyGcUJRK4cJP0YQ8H8HdYw86xEhlcdJHvnObkCU6tSBcVbDWM8uoXJlRqNl6o-IdxoSfbk6IjuCreyagMXvam4vgV0HKxn0nkWaV26k1P6kQP_L1LtXXx2UyUQ1i0jJGL9JiGr1gsUbf5drY_URIrEWzawumpnSWkuxln8hiOtAr_xwM_4cBZwxf3_pWq8YnUotpmzzM5sPhW_ERMYWAdovjZPHu7Xdgs&access_token=329734847193179%7Cd9e5cdb2d0c3cbe1e127827762e94284&appsecret_proof='key_proof'
                            [1] => GET
                            [2] => Array
                                (
                                )    
                        )    
                )

            [1] => Array
                (
                    [file] => C:\xampp\htdocs\myapp\Facebook\FacebookRedirectLoginHelper.php
                    [line] => 146
                    [function] => execute
                    [class] => Facebook\FacebookRequest
                    [type] => ->
                    [args] => Array
                        (
                        )    
                )

            [2] => Array
                (
                    [file] => C:\xampp\htdocs\myapp\index.php
                    [line] => 52
                    [function] => getSessionFromRedirect
                    [class] => Facebook\FacebookRedirectLoginHelper
                    [type] => ->
                    [args] => Array
                        (
                        )    
                )    
        )    
    [previous:Exception:private] => 
)