/**
* @param string $returnUrl
*
* @return string
*/
public function getLoginUrl($returnUrl)
{
$config = array('consumerKey' => $this->consumerKey, 'consumerSecret' => $this->consumerSecret, 'callbackUrl' => $returnUrl, 'siteUrl' => 'https://api.twitter.com/oauth', 'authorizeUrl' => 'https://api.twitter.com/oauth/authenticate');
$httpClientOptions = array('adapter' => 'Zend\\Http\\Client\\Adapter\\Curl', 'curloptions' => array(CURLOPT_SSL_VERIFYHOST => false, CURLOPT_SSL_VERIFYPEER => false));
$consumer = new Consumer($config);
$consumer->setHttpClient($consumer->getHttpClient()->setOptions($httpClientOptions));
$token = $consumer->getRequestToken();
$tw_session = new Container('twitter');
$tw_session->offsetSet('request_token', serialize($token));
return $consumer->getRedirectUrl();
}