Facebook使用用户ID检索特定用户详细信息

Question

我正在使用fb php sdk。当用户使用fb注册时，我将fb用户ID存储在数据库中。但是，当我想使用fb用户ID获取详细信息时，它会返回错误。我想使用fb用户ID返回值。如果有人知道，请帮忙。

$fb = new Facebook\Facebook(['app_id' => 'app_id', 'app_secret' => 'app_secret','default_graph_version' => 'v2.5']);    
$helper = $fb->getRedirectLoginHelper();
try {
    $accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
    echo 'Graph returned an error: ' . $e->getMessage();
    exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
    echo 'Facebook SDK returned an error: ' . $e->getMessage();
    exit;
}
if (! isset($accessToken)) {
    if ($helper->getError()) {
        header('HTTP/1.0 401 Unauthorized');
        echo "Error: " . $helper->getError() . "\n";
        echo "Error Code: " . $helper->getErrorCode() . "\n";
        echo "Error Reason: " . $helper->getErrorReason() . "\n";
        echo "Error Description: " . $helper->getErrorDescription() . "\n";
    } else {
        header('HTTP/1.0 400 Bad Request');
        echo 'Bad request';
    }
    exit;
}
$oAuth2Client = $fb->getOAuth2Client();
$tokenMetadata = $oAuth2Client->debugToken($accessToken);
$_SESSION['fb_access_token'] = (string) $accessToken;
$fb->setDefaultAccessToken($accessToken);
try {
    $response = $fb->get('/me?fields=id,name,link,email,gender,cover,picture,friends');
} catch(Facebook\Exceptions\FacebookResponseException $e) {
    echo 'Graph returned an error: ' . $e->getMessage();
    exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
    echo 'Facebook SDK returned an error: ' . $e->getMessage();
    exit;
}
$user = $response->getGraphUser();