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

Since Woocommerce version 3.0+ to update status you need to do this

$order = wc_get_order( $order_id );

if($order){
   $order->update_status( 'pending', '', true );
}