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* @file
* Check if consumer token is set and if so send user to get a request token.
* Exit with an error message if the CONSUMER_KEY or CONSUMER_SECRET is not defined.
if (CONSUMER_KEY === '' || CONSUMER_SECRET === '') {
echo 'You need a consumer key and secret to test the sample code. Get one from <a href=""></a>';
/* Build an image link to start the redirect process. */
$content = '<a href="./redirect.php"><img src="./images/lighter.png" alt="Sign in with Twitter"/></a>';
/* Include HTML to display on the page. */