Login to the web using cURL

I am trying to login to a web site through cURL in PHP to later web scraping the resulting page when logging in. I am using the following code:

<?php

    $url = 'URL en la que quiero logearme';
    $ch = curl_init();
    $parametros_post = 'ips_username='.urlencode("nombre de Usuario").'&ips_password='.urlencode("contraseña").'&rememberMe='.urlencode("1").'&anonymous='.urlencode("1");

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0');
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept-Language: es-es,en"));

    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $parametros_post);

    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);

    //Guardar página
    $result = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);

    //Comprobar si ha hecho login en la página
    echo $result;
?>

Clarifications:

• As $url I used what appears on the page within the "action" field of <form> login.
• In the variable $parametros_post I have included all fields <input> of the form that had a "name" tag with the value of my user or failing that with the value that appeared in its "value" tag.
• The submit button did not contain a "name" tag, so I did not include it in the variable $parametros_post (although it did contain type, class, value and tabIndex, I do not know if it will influence anything).
• I am using a localhost through WampServer with Apache and PHP 5.4.3.
• Cookies must be incorrectly configured because when I start the .php file on my localhost I get Notice: Undefined variable: cookie_file .
• When opening the .php file in localhost, in the web page I'm trying to log in to, a message appears saying Sorry, you don't have permission for that. We encountered a problem precessing your login request , that is, when processing the php request instead of sending me to the home page and logged in they send me to an error page, I guess because I do not have cookies properly set up.
• The page I'm trying to log in to is https, in case it works or changes something.