Passing $_GET paramaters to cron job
* 3 * * * /path_to_script/cronjob.php?username=test&password=test&code=1234

* 3 * * * /path_to_script/cronjob.php username=test password=test code=1234

<?php parse_str($argv[n]); ?>

session_start();

if (isset($_SESSION['user']))
{
  include '/path/to/script/outside/of/web-root';
}
else
{
  die('No access.');
}

* 3 * * * /path_to_script/cronjob.php username=test password=test code=1234