How to get current order reference

[r00t3r]

Hello, guys i have one question how to get order refference in hookDisplayAdminOrder i try this method but nothing 

 

public function hookDisplayAdminOrder()
    {
		$orderid - Tools::getValue('id_order');
        echo $orderid;
    }

I just want to get order refference and make it variable with him

Edited September 15, 2018 by r00t3r
I just edit code to be great example :) (see edit history)

[Daresh]

$order = new Order($orderid);
$ref = $order->reference;

 

[r00t3r]

1 hour ago, Daresh said:

$order = new Order($orderid);
$ref = $order->reference;

 

Mmm still not workin  

public function hookDisplayAdminOrder()
    {
		$orderid - Tools::getValue('id_order');
		$order = new Order($orderid);
        $ref = $order->reference;
        echo $ref;
    }