<form name=form id=form method=POST action="login.php">
  <input type=text name=user id=user value="">
  <input type=password name=pass id=pass>
  <input type=submit value="OK" id=sendButton name="sendButton">
  <input type=hidden name=pass2>
  <input type=hidden name=token value="7b8b7d712273aa254e03ea04a30322ab">
</form>

user=test&pass=&login=OK&pass2=7c7e36071354b4ecde365b315ffa4406&token=

$url = 'http://www.myurl.com/login.php';

$ch = curl_init();

curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_REFERER, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);

$content = curl_exec($ch);

$doc = new DOMDocument();
$doc->loadHTML($content);

$tags = $doc->getElementsByTagName('input');

foreach ($tags as $tag) {
    if($tag->getAttribute('name') === 'token') {
         $token = $tag->getAttribute('value');
    }
}

foreach ($tags as $tag) {
    if($tag->getAttribute('name') === 'pass2') {
         $pass2 = $tag->getAttribute('value');
    }
}

$com = 'OK';
$postdata = 'user='.$user.'&pass='.$pass.'&sendButton='.$com.'&pass2='.$pass2.'&token='.$token;

curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt ($ch, CURLOPT_POST, 1);
$result = curl_exec ($ch);

echo $result;