code: public function getLoginStartUrl($redirecturl) {
  		$connection = new TwitterOAuth($this->options['consumer_key'],$this->options['consumer_secret']);
  		$connection->setTimeouts(10, 15);
  		$request_token = $connection->oauth('oauth/request_token', array('oauth_callback' => $redirecturl));
  		
  		$this->request_token = array();
  		$this->request_token['oauth_token'] = $request_token['oauth_token'];
  		$this->request_token['oauth_token_secret'] = $request_token['oauth_token_secret'];
  		
  		return $connection->url('oauth/authorize', array('oauth_token' => $request_token['oauth_token']));
  	}
docs: Returns twitter login start auth process
  
  @param string $redirecturl URL where to redirect after login complete