public function create_user()
	{
		global $db;

		$username = $_POST['req_username'];
		$password = $_POST['req_password1'];
		$email = $_POST['req_email'];
		$first_name = $_POST['req_firstname'];
		$last_name = $_POST['req_lastname'];
		$year = $_POST['req_year'];
		$month = $_POST['req_month'];
		$day = $_POST['req_day'];
		$gender = $_POST['req_gender'];
		$school = $_POST['req_school'];

		/*
			Check if the username has
			been registered.
		*/
		$result = $db->query('SELECT `username` FROM `users` WHERE `username` = \''.$db->escape($username).'\'');
		if ($db->num_rows($result) > 0)
			$this->error_msg = 'The username: '.$username.' you are trying to sign up with, has already been registered.';

		/*
			Check if the email addresss has
			been registered.
		*/
		$result = $db->query('SELECT `email` FROM `users` WHERE `email` = \''.$db->escape($email).'\'');
		if ($db->num_rows($result) > 0)
			$this->error_msg = 'The e-mail address: '.$email.' you are trying to sign up with, has already been registered.';

		/*
			If no errors are found
			create the user.
		*/
		if (!$this->error_msg)
			$result = $db->query('INSERT INTO `users`(`username`, `password`, `email`, `first_name`, `last_name`, `birthday`, `gender`, `school`) VALUES(\''.$db->escape($username).'\', \''.$db->escape($this->hash_pass($password)).'\', \''.$db->escape($email).'\', \''.$db->escape($first_name).'\', \''.$db->escape($last_name).'\', \''.$year. '-' .$month. '-' .$day.'\', \''.$gender.'\', \''.$school.'\')');
	}