PageTabHelper.md

Facebook\Helper\PageTabHelper

Page tabs are similar to the context to app canvases but are treated slightly differently. Use the FacebookPageTabHelper to obtain an access token or signed request within the context of a page tab.

Usage

The usage of the FacebookPageTabHelper is exactly the same as FacebookCanvasHelper with additional methods to obtain the page data from the signed request.

$fb = new Facebook\Facebook([/* */]);
$pageHelper = $fb->getPageTabHelper();
$signedRequest = $pageHelper->getSignedRequest();

if ($signedRequest) {
  $payload = $signedRequest->getPayload();
  var_dump($payload);
}

If a user has already authenticated your app, you can also obtain an access token.

$fb = new Facebook\Facebook([/* */]);
$pageHelper = $fb->getPageTabHelper();

try {
  $accessToken = $pageHelper->getAccessToken();
} catch(Facebook\Exception\ResponseException $e) {
  // When Graph returns an error
  echo 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exception\SDKException $e) {
  // When validation fails or other local issues
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
}

if (isset($accessToken)) {
  // Logged in.
}

Instance Methods

getPageData()

public string|null getPageData($key, $default = null)

Gets a value from the page property if present.

isAdmin()

public boolean isAdmin()

Returns true is the user has authenticated your app and is an admin of the parent page.

getPageId()

public string|null getPageId()

Returns the ID of the parent page if it can be obtained from the page property in the signed request.