PHP:: Facebook getLoginUrl iframe next parameter redirect issue

DUE TO FREQUENT FACEBOOK API CHANGES THIS ARTICLE IS OUTDATED.

The php-sdk from Facebook has some bugs in it.

http://stackoverflow.com/questions/3380876/how-to-authorize-facebook-app-using-redirect-in-canvas http://forum.developers.facebook.net/viewtopic.php?id=70575

These solutions didn't work for me, so I had to change the function getLoginUrl in class Facebook

  public function getLoginUrl($params=array()) {
 $currentUrl = $this->getCurrentUrl();
 $args = array(
        'api_key'         => $this->getAppId(),
        'cancel_url'      => 'http://www.facebook.com/',
        'display'         => 'page',
        'fbconnect'       => 0,
        'next'            => $currentUrl,
        'return_session'  => 1,
        'session_version' => 3,
  'canvas'          => 1,
        'v'               => '1.0',
      );
 foreach($params as $key=>$val) {
  $args[$key] = $val;
 }
 return $this->getUrl(
  'www',
  'login.php',
  $args
 );
  }

Example:

if($me) {
 $logoutUrl = $facebook->getLogoutUrl();
} else {
 $loginUrl = $facebook->getLoginUrl(array('next'=>'http://apps.facebook.com/xxxxxxx/'));
 ?>
 <script type="text/javascript">
 top.location.href = '<?=$loginUrl?>';
 </script>
 <?php 
 exit;
}