bi siteden örnek kod aldım uzun uzun yazmaya üşendim açıkçası
değişkenleri tanımlıyosun öncelikle malum şekil a-1:

$id = "id";
$password = "password";
$cookie_file_path = "absolute_server_path/httpdocs/cookiejar/";
$loginURL = "https://www.signin.example.com/loginForm.html";
$agent = "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)";
$POSTFIELDS = 'UserName='.$id.'&hiddenVar1=hiddenVar1Value&UserP ass='.$password;

----curl başlatıosun login olmak için----

$ch = curl_init();
curl_setopt($ch, curlOPT_URL,$loginURL);
curl_setopt($ch, curlOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, curlOPT_USERAGENT, $agent);
curl_setopt($ch, curlOPT_RETURNTRANSFER,1);
curl_setopt($ch, curlOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, curlOPT_COOKIEFILE, $cookie_file_path); //cookie dosyası oluştup yazma
curl_setopt($ch, curlOPT_COOKIEJAR, $cookie_file_path);
curl_setopt($ch, curlOPT_SSL_VERIFYPEER, FALSE); // https altında çalışmasını sağlar

$result=curl_exec ($ch);
curl_close ($ch);

echo("Results: <br>".$result);

//login için post mantığı
$loginURL = "https://www.signin.example.com/loginForm.html";
$reffer = "https://www.signin.example.com/loginForm.html";

$ch = curl_init();
curl_setopt($ch, curlOPT_URL,$loginURL);
curl_setopt($ch, curlOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, curlOPT_USERAGENT, $agent);
curl_setopt($ch, curlOPT_POST, 1);
curl_setopt($ch, curlOPT_POSTFIELDS,$POSTFIELDS);
curl_setopt($ch, curlOPT_RETURNTRANSFER, 1);
curl_setopt($ch, curlOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, curlOPT_REFERER, $reffer);
curl_setopt($ch, curlOPT_COOKIEFILE, $cookie_file_path);
curl_setopt($ch, curlOPT_COOKIEJAR, $cookie_file_path);
curl_setopt($ch, curlOPT_SSL_VERIFYPEER, FALSE);
$result = curl_exec ($ch);
curl_close ($ch);

echo("Results: <br>".$result);