Question

首先让我们来看看两个文件：

index.php

<?php session_start(); ?>
<!doctype html>
<html>
<head>
  <meta charset="utf=8" />
  <title>FB App</title>
</head>
<body>

  <?php
  define( 'FACEBOOK_SDK_V4_SRC_DIR', 'src/Facebook/');
  require __DIR__ . '\autoload.php';

  use Facebook\FacebookRedirectLoginHelper;

  $helper = new FacebookRedirectLoginHelper( 'http://localhost/app/back.php','APP_ID', 'APP_SECRET' );
  echo '<a href="' . $helper->getLoginUrl() . '">Login with Facebook</a>';
  ?>

</body>
</html>

back.php

<?php session_start(); ?>
<?php
define('FACEBOOK_SDK_V4_SRC_DIR', 'src/Facebook/');
require __DIR__ . '\autoload.php';

use Facebook\FacebookSession;
use Facebook\FacebookRequest;
use Facebook\GraphUser;
use Facebook\FacebookRequestException;
use Facebook\FacebookRedirectLoginHelper;

FacebookSession::setDefaultApplication( 'APP_ID', 'APP_SECRET' );
$helper = new FacebookRedirectLoginHelper( 'http://localhost/app/back.php' );
try {
    $session = $helper->getSessionFromRedirect();
} catch(FacebookRequestException $ex) {
    // When Facebook returns an error
} catch(\Exception $ex) {
   // When validation fails or other local issues
}
if ( $session ) {
    // Logged in.
    echo 'logged in';
    echo '<hr/>';
    // set session from cookie or via helper
    $user_id = $session->getSessionInfo()->asArray()['user_id'];
    $request = new FacebookRequest(
        $session,
        'GET',
        '/' . $user_id
    );
    $response = $request->execute();
    $graphObject = $response->getGraphObject();
    echo 'you are ' . $graphObject->getProperty( 'name' );
}
?>
<!doctype html>
<html>
<head>
  <meta charset="utf=8" />
  <title>FB App BACK</title>
</head>
<body>
</body>
</html>

登录成功进行，我可以看到我已登录。但是，当重新加载页面时，我得到Undefined variable: session in C:\wamp\www\app\back.php on line 21，这是行

if ( $session ) {

如何在包含多个页面的网站中保持会话？

FB API PHP SDK - 刷新页面时会话丢失

0 个答案: