function addUser(){

	global $connection;

	if(isset($_POST['submit'])){

		$username = $_POST['username'];
		$password = $_POST['password'];
		$display_name = $_POST['display_name'];
		$email = $_POST['email'];
		$carrier_id = ['carrier'];

		$salt = hash('sha256', randomString());
		$salt = hash('sha256', $salt);

		$password = hash('sha256', $password);
		$password = hash('sha256', $salt . $password);

		$userhash = hash('sha256', $username);

		$token = hash('sha256', randomString());
		$token = hash('sha256', $token);

		$query = $connection->prepare("

			INSERT INTO users(carrierID,username,username_hash,password,display_name,email,salt,token)
			VALUES (:carrier_id, :username, :userhash, :password, :display_name, :email, :salt, :token)

		");
		$query->execute([

			'carrier_id'=>$carrier_id,
			'username'=>$username,
			'userhash'=>$userhash,
			'password'=>$password,
			'display_name'=>$display_name,
			'email'=>$email,
			'salt'=>$salt,
			'token'=>$token

		]);
		header("Location: users.php");
		}

}