Magento 2.3 Change Order Status Programmatically

Question

How to Order status change Processing to complete in magento 2.3

Answer 1

You can Change status this way..

    $orderId = 1; // here order id

    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $order = $objectManager->create('\Magento\Sales\Model\Order')
                               ->load($orderId); 

    $order->setState("complete")->setStatus("complete");

    $order->save();

Answer 2

You can Change the order status to complete using repository Class of order entity \Magento\Sales\Api\OrderRepositoryInterface

    $order = $this->orderRepository->get($orderiId);
    $order->setStatus($completeStatus)->setState($completeStatus);
    $this->orderRepository->save($order); 

Code Looks Like:

<?php
namespace {ClassNameSpace};

use Magento\Framework\Exception\NoSuchEntityException;

class Test {

    /**
     * @var \Magento\Sales\Api\OrderRepositoryInterface
     */
    private $orderRepository;

    public function __construct(
    \Magento\Sales\Api\OrderRepositoryInterface $orderRepository      
    ) {

        $this->orderRepository = $orderRepository;
    }
    public function ChangeOrderStatusToComplete()
    {
        $completeStatus = \Magento\Sales\Model\Order::STATE_COMPLETE;
        $id = 2;
        try{
            $order = $this->orderRepository->get($id);
            $order->setStatus($completeStatus)->setState($completeStatus);
            $this->orderRepository->save($order);           
        } catch (NoSuchEntityException $ex) {
            // error Happen
        }


    }
}

Answer 3

This is duplicated from this Link

use Magento\Sales\Model\Order;

$orderId = 1;
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$order = $objectManager->create('\Magento\Sales\Model\Order') ->load($orderId);
$orderState = Order::STATE_COMPLETE;
$order->setState($orderState)->setStatus(Order::STATE_COMPLETE);
$order->save();