WooCommerce - change order status with php code

Question

I am trying to change order status in WooCommerce, but I encountered no luck so far. $order instance is created successfully (I know it because echo $order->status;

Answer 1

Working with woocommerce v4.4, other answers were not working for me. I had to do it this way,

$order = wc_get_order($order_id);
$order->set_status('pending');
$order->save();

Note: Woocommerce internally adds wc prefix, you will see it if you view in the database. We do not need to explicitly add it.