OAUTH Issue

<?php
/*
 * test_oauth_client.php
 *
 * @(#) $Id: test_oauth_client.php,v 1.5 2013/07/31 11:48:04 mlemos Exp $
 *
 */

    /*
     *  Get the http.php file from http://www.phpclasses.org/httpclient
     */
    require('../http-client/http.php');
    require('oauth_client.php');

    /* Create the OAuth authentication client class */
    $client = new oauth_client_class;

    /*
     * Set to true if you want to make the class dump
     * debug information to PHP error log
     */
    $client->debug = true;

    /*
     * Set to true if you want to make the class also dump
     * debug output of the HTTP requests it sends.
     */
    $client->debug_http = false;

    /* OAuth server type name
     * Setting this variable to one of the built-in supported OAuth servers
     * will make the class automatically set all parameters specific of that
     * type of server.
     *
     * Currently, built-in supported types are: Facebook, github, Google,
     * Microsoft, Foursquare, Twitter and Yahoo.
     *
     * Send e-mail to mlemos at acm.org if you would like the class to have
     * built-in support to access other OAuth servers.
     *
     * Set to an empty string to use another type of OAuth server. Check the
     * documentation to learn how to set other parameters to configure the
     * class to access that server
     */
    $client->server = 'Twitter';

    /* OAuth authentication URL identifier
     * This should be the current page URL without any request parameters
     * used by OAuth, like state and code, error, denied, etc..
     */
    $client->redirect_uri = 'http://'.$_SERVER['HTTP_HOST'].
        dirname(strtok($_SERVER['REQUEST_URI'],'?')).'/test_oauth_client.php';

    /* OAuth client identifier
     * Set this to values defined by the OAuth server for your application
     */
    $client->client_id = 'SET YOURS';

    /* OAuth client secret
     * Set this to values defined by the OAuth server for your application
     */
    $client->client_secret = 'SET YOURS';

    /* OAuth client permissions
     * Set this to the name of the permissions you need to access the
     * application API
     */
    $client->scope = '';

    /* Process the OAuth server interactions */
    if(($success = $client->Initialize()))
    {
        /*
         * Call the Process function to make the class dialog with the OAuth
         * server. If you previously have retrieved the access token and set
         * the respective class variables manually, you may skip this call and
         * use the CallAPI function directly.
         */
        $success = $client->Process();
        // Make sure the access token was successfully obtained before making
        // API calls

    // MUST BE SET TO FALSE IF I WANT THAT API CALLS USING PARAMETERS ARRAY TO SUCCEED
        // $client->authorization_header = false;

        $client->CallAPI('https://api.twitter.com/1.1/account/verify_credentials.json','GET', array(), array('FailOnAccessError'=>false,'ConvertObjects'=>1),$users);
        echo "<pre>";
        print_r($users);
        echo "</pre>";

        $client->CallAPI('https://api.twitter.com/1.1/followers/ids.json','GET', array(), array('FailOnAccessError'=>false,'ConvertObjects'=>1),$followers);
        echo "<pre>";
        print_r($followers);
        echo "</pre>";

        $client->CallAPI('https://api.twitter.com/1.1/followers/ids.json','GET', array(), array('FailOnAccessError'=>false,'ConvertObjects'=>1),$followers);
        echo "<pre>";
        print_r($followers);
        echo "</pre>";

    // NOT WORKING IF authorization_header IS NOT SET TO FALSE
        $client->CallAPI('https://api.twitter.com/1.1/search/tweets.json','GET', array('q' => 'factornews'), array('FailOnAccessError'=>false,'ConvertObjects'=>1),$tweets);
        echo "<pre>";
        print_r($tweets);
        echo "</pre>";


        /*
         * if(strlen($client->access_token))
         * {
         *   $success = $client->CallAPI();
         * }
         */

        /* Internal cleanup call
         */
        $success = $client->Finalize($success);
    }
    /*
     * If the exit variable is true, the script must not output anything
     * else and exit immediately
     */
    if($client->exit)
        exit;

    if($success)
    {
        /*
         * The Output function call is here just for debugging purposes
         * It is not necessary to call it in real applications
         */
        $client->Output();
    }
    else
    {
        /*
         * If there was an unexpected error, display to the user
         * some useful information
         */
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>OAuth client error</title>
</head>
<body>
<h1>OAuth client error</h1>
<pre>Error: <?php echo HtmlSpecialChars($client->error); ?></pre>
</body>
</html>
<?php
    }

?>