我想在drupal 7中使用Curl登录intomoodle

Question

我正在尝试使用curl登录moodle。任何人都可以告诉我代码中有什么问题。我已经制作了一个模块，其中我有一个提交按钮，这样当我按提交时它必须登录moodle。

function usmancurl_submit() {
  $crl = curl_init();
  $url = "http://localhost/moodle/login/index.php";
  curl_setopt($crl, CURLOPT_URL, $url);
  curl_setopt($crl, CURLOPT_COOKIEFILE, "/tmp/cookie.txt");
  curl_setopt($crl, CURLOPT_COOKIEJAR, "/tmp/cookie.txt");
  curl_setopt($crl, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($crl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($crl, CURLOPT_POST, 1);

  $postdata = array(
    "edit[name]" => "usman",
    "edit[pass]" => "Usman5463",
    "edit[form_id]" => "user_login",
    "op" => "Log in"
  );
  // Tell curl we're going to send $postdata as the POST data
  curl_setopt($crl, CURLOPT_POSTFIELDS, $postdata);

  $result = curl_exec($crl);
  $headers = curl_getinfo($crl);
  curl_close($crl);

  if ($headers['url'] == $url) {
    die("Cannot login.");
  }
}