TwitterOAuth PHP Authentication request_token

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I have set up an AWS instance with a LAMP stack and am trying to build a simple login with Twitter button using Abraham's TwitterOAuth (https://twitteroauth.com/redirect.php).

I've set up the config.php file to have the key, secret, and callback url that match the apps.twitter.com details. Here is my login.php file:

<?php

require "twitteroauth/autoload.php";

echo "require<br>";

use Abraham\TwitterOAuth\TwitterOAuth;

echo "use <br>";

session_start();

echo"session started <br>";

define('CONSUMER_KEY', getenv('CONSUMER_KEY'));
define('CONSUMER_SECRET', getenv('CONSUMER_SECRET'));
define('OAUTH_CALLBACK', getenv('OAUTH_CALLBACK'));

echo"vars defined <br>";

$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $access_token, $access_token_secret);
//$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET);

echo "connection established <br>";
echo OAUTH_CALLBACK;

$request_token = $connection->oauth('oauth/request_token', array('oauth_callback' => OAUTH_CALLBACK));

echo "token requested<br>";

$_SESSION['oauth_token'] = $request_token['oauth_token'];
$_SESSION['oauth_token_secret'] = $request_token['oauth_token_secret'];

$url = $connection->url('oauth/authorize', array('oauth_token' => $request_token['oauth_token']));


?>

All the echoes work up until $request_token at which point it breaks. I've also tried without the echoes, but it still doesn't make it to the redirect step. Any help would be greatly appreciated! Thank you.

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Rob On

Was able to figure out that I had the key, secret and callback defined incorrectly at the top. Needed to use the variable name $CONSUMER_KEY instead of the environmental name.