API 1.1, authentication problems when triying to get another user's timeline

<?php

function buildBaseString($baseURI, $method, $params) {
    $r = array();
    ksort($params);
    foreach($params as $key=>$value){
        $r[] = "$key=" . rawurlencode($value);
    }
    return $method."&" . rawurlencode($baseURI) . '&' . rawurlencode(implode('&', $r));
}

function buildAuthorizationHeader($oauth) {
    $r = 'Authorization: OAuth ';
    $values = array();
    foreach($oauth as $key=>$value)
        $values[] = "$key=\"" . rawurlencode($value) . "\"";
    $r .= implode(', ', $values);
    return $r;
}

$url = "https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=TheRoyalGod";


$oauth_access_token = "XXXXXXXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXX";
$oauth_access_token_secret = "XXXXXXXXXXXXXXXXXX";
$consumer_key = "XXXXXXXXXXXXXXXXXXXX";
$consumer_secret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";

$oauth = array( 'oauth_consumer_key' => $consumer_key,
                'oauth_nonce' => time(),
                'oauth_signature_method' => 'HMAC-SHA1',
                'oauth_token' => $oauth_access_token,
                'oauth_timestamp' => time(),
                'oauth_version' => '1.0');

$base_info = buildBaseString($url, 'GET', $oauth);
$composite_key = rawurlencode($consumer_secret) . '&' . rawurlencode($oauth_access_token_secret);
$oauth_signature = base64_encode(hash_hmac('sha1', $base_info, $composite_key, true));
$oauth['oauth_signature'] = $oauth_signature;

// Make Requests
$header = array(buildAuthorizationHeader($oauth), 'Expect:');

$feed = curl_init();

curl_setopt($feed,CURLOPT_HTTPHEADER, $header);
curl_setopt($feed,CURLOPT_HEADER, false);
curl_setopt($feed,CURLOPT_URL, $url);
curl_setopt($feed,CURLOPT_RETURNTRANSFER, true);
curl_setopt($feed,CURLOPT_SSL_VERIFYPEER, false);

$json = curl_exec($feed);
curl_close($feed);

$twitter_data = json_decode($json);
var_dump($twitter_data);