Laravel 4 使用数据从控制器向外部 url 发出 post 请求

I am looking for a way to make a post request from a controller to an external url. The data being posted is a php array. The url to recieve is an ecommerce API in an external url. The post has to be done from the controller method. The url should reply with 'success', 'error', 'failure' or 'trylater' string. I have tried the following with no success:

    return Redirect::to("https://backoffice.host.iveri.com/Lite/Transactions/New/Authorise.aspx", compact($array));

我也试过 curl:

    $url = 'https://backoffice.host.iveri.com/Lite/Transactions/New/Authorise.aspx';
    //url-ify the data for the POST
    $fields_string ='';
    foreach($array as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
    rtrim($fields_string,'& ');

    //open connection
    $ch = curl_init();

    //set the url, number of POST vars, POST data
    curl_setopt($ch,CURLOPT_URL, $url);
    curl_setopt($ch,CURLOPT_POST, count($array));
    curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    //execute post
    $result = curl_exec($ch);

    //close connection
    curl_close($ch);

正在发送的数组的一部分是 API 用来响应的回调:

'Lite_Website_Successful_url' => 'https://mydomain.com/order/'.$order_id,
'Lite_Website_Fail_url' => 'https://mydomain.com/checkout/fail',
'Lite_Website_TryLater_url' => 'https://mydomain.com/checkout/trylater',
'Lite_Website_Error_url' => 'https://mydomain.com/checkout/error'