Wordpress admin order Details Page how to get order id in php File?

Question

Wordpress i want to send sms when admin cancel order from backed i can not find how to get order id in back-end using php file

Answer 1

Get order details from order id
 $order = wc_get_order( $order_id );
if ( $order ) {
       // Get Order ID and Key
    $order->get_id();
    $order->get_order_key();
}