Get the login URL to sign in with twitter

TwitterApiLoginUrl.php

/**
 * get the login url from oauth
 *
 * @return string $loginUrl
 */
public function getLoginUrl() {

	// create the twitterOAuth object using your consumer_key and consumer_secret, after creating an app on
	// dev.twitter.com/apps
	$this->twitterOAuth = new TwitterOAuth($this->consumerKey, $this->consumerSecret);

	// get a request token from twitter
	$requestToken = $this->twitterOAuth->getRequestToken($this->callback);

	$this->oauthToken = $requestToken['oauth_token'];
	$this->oauthTokenSecret = $requestToken['oauth_token_secret'];

	// get the url to make it possible to login.
	$loginUrl = $this->twitterOAuth->getAuthorizeUrl($this->oauthToken);

	return $loginUrl;
}