PHP - TwitterOAuthLogin～Callback

gistfile1.php

<?php
// ----- Authorization ----- //
$consumerKey = TWITTER_CONSUMER_KEY;
$consumerSecret = TWITTER_CONSUMER_SECRET;

$callbackUrl = "http://example.com/action/TwitterAuthCallback";

$oAuth = new HTTP_OAuth_Consumer($consumerKey, $consumerSecret);
$httpRequest = new HTTP_Request2();
$httpRequest->setConfig("ssl_verify_peer", false);
$consumerRequest = new HTTP_OAuth_Consumer_Request;
$consumerRequest->accept($httpRequest);
$oAuth->accept($consumerRequest);

$oAuth->getRequestToken("https://twitter.com/oauth/request_token", $callbackUrl);
$_SESSION["oauth_request_token"] = $oAuth->getToken();
$_SESSION["oauth_request_token_secret"] = $oAuth->getTokenSecret();

$authorizeUrl = $oAuth->getAuthorizeURL("https://twitter.com/oauth/authorize");

header("Location: " . $authorizeUrl);
?>

<?php
// ----- callback ----- //
$consumerKey = CONSUMER_KEY;
$consumerSecret = CONSUMER_SECRET;

$oAuth = new HTTP_OAuth_Consumer($consumerKey, $consumerSecret);
$httpRequest = new HTTP_Request2();
$httpRequest->setConfig("ssl_verify_peer", false);
$consumerRequest = new HTTP_OAuth_Consumer_Request;
$consumerRequest->accept($httpRequest);
$oAuth->accept($consumerRequest);

$oAuthToken = $_GET{"oauth_token"};
$oAuth->setToken($oAuthToken);
$oAuth->setTokenSecret($_SESSION["oauth_request_token_secret"]);
$oAuthVerifier = $_REQUEST["oauth_verifier"];

$_SESSION["oauth_request_token"] = null;
$_SESSION["oauth_request_token_secret"] = null;

$oAuth->getAccessToken("https://twitter.com/oauth/access_token", $oAuthVerifier);

$accessToken = $oAuth->getToken();
$accessTokenSecret = $oAuth->getTokenSecret();
?>