object(Facebook\Helpers\FacebookRedirectLoginHelper)#7 (4) {
  ["oAuth2Client":protected]=>
  object(Facebook\Authentication\OAuth2Client)#8 (4) {
    ["app":protected]=>
    object(Facebook\FacebookApp)#3 (2) {
      ["id":protected]=>
      string(15) "633294576830602"
      ["secret":protected]=>
      string(32) "12842b3f252eb5242aa3b586ac7c01d4"
    }
    ["client":protected]=>
    object(Facebook\FacebookClient)#4 (2) {
      ["enableBetaMode":protected]=>
      bool(false)
      ["httpClientHandler":protected]=>
      object(Facebook\HttpClients\FacebookCurlHttpClient)#5 (4) {
        ["curlErrorMessage":protected]=>
        string(0) ""
        ["curlErrorCode":protected]=>
        int(0)
        ["rawResponse":protected]=>
        NULL
        ["facebookCurl":protected]=>
        object(Facebook\HttpClients\FacebookCurl)#6 (1) {
          ["curl":protected]=>
          NULL
        }
      }
    }
    ["graphVersion":protected]=>
    string(4) "v2.8"
    ["lastRequest":protected]=>
    NULL
  }
  ["urlDetectionHandler":protected]=>
  object(Facebook\Url\FacebookUrlDetectionHandler)#10 (0) {
  }
  ["persistentDataHandler":protected]=>
  object(Facebook\PersistentData\FacebookSessionPersistentDataHandler)#9 (1) {
    ["sessionPrefix":protected]=>
    string(6) "FBRLH_"
  }
  ["pseudoRandomStringGenerator":protected]=>
  object(Facebook\PseudoRandomString\OpenSslPseudoRandomStringGenerator)#11 (0) {
  }
}
<a href="https://www.facebook.com/v2.8/dialog/oauth?client_id=633294576830602&state=4d4f0e31cba5f385fdee05616f5b17f7&response_type=code&sdk=php-sdk-5.0.0&redirect_uri=http%3A%2F%2Fmy.circleng.com%2Flogin-callback.php&scope=email%2Cuser_likes">Log in with Facebook!</a>