Twitch json problem

if (!empty($_GET)) {
    $url = "https://api.twitch.tv/kraken/oauth2/token";
    $data = Array(
        "client_id" => "#",
        "client_secret" => "#",
        "grant_type" => "authorization_code",
        "redirect_uri" => "http://localhost/twitchTest",
        "code" => $_GET['code'],
        "state" => ""
    );

    $data_string = "";
    foreach ($data as $key => $value) {
        $data_string .= $key . '=' . $value . '&';
    }
    $data_string = substr_replace($data_string, '', -1);

    try {
        $ch = curl_init();
        if ($ch === false) {
            throw new Exception("Failed to initialize");
        }
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, count($data));
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        $result = curl_exec($ch);
        if ($result === false) {
            throw new Exception(curl_error($ch), curl_errno($ch));
        }
        curl_close($ch);
        var_dump($result);
        $gebruiker = json_decode($result, true);
        var_dump($gebruiker);
        } catch (Exception $e) {
        trigger_error(sprintf("Curl failed with error #%d: %s", $e->getCode(), $e->getMessage()), E_USER_ERROR);
    }
}