Kdjykuj

In my success.phtml , $block->getViewOrderUrl() gives a order url with order id(entity id) .

dev/tests/functional/tests/app/Magento/Checkout/Test/Block/Onepage/Success.php

/sales/order/view/order_id/173569/

How to get this order id alone - 173569 in success.phtml.

I don't see any functions in success.php

You can try this one to get the order Id alone:

$block->getOrderId()

UPDATE:

You can override the Block file of checkout success one page using preference and define your own method to get the order Id.

Try this:

In your custom module's di.xml file add this:

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="MagentoCheckoutBlockOnepageSuccess" type="VendorModuleBlockOnepageSuccess" />

</config>  

Now create Success.php Block file in Folder VendorModuleBlockOnepage

<?php

/**

 * Copyright © Magento, Inc. All rights reserved.

 * See COPYING.txt for license details.

 */

namespace VendorModuleBlockOnepage;



use MagentoCustomerModelContext;

use MagentoSalesModelOrder;



/**

 * One page checkout success page

 *

 * @api

 * @since 100.0.2

 */

class Success extends MagentoFrameworkViewElementTemplate

{

    /**

     * @var MagentoCheckoutModelSession

     */

    protected $_checkoutSession;



    /**

     * @var MagentoSalesModelOrderConfig

     */

    protected $_orderConfig;



    /**

     * @var MagentoFrameworkAppHttpContext

     */

    protected $httpContext;



    /**

     * @param MagentoFrameworkViewElementTemplateContext $context

     * @param MagentoCheckoutModelSession $checkoutSession

     * @param MagentoSalesModelOrderConfig $orderConfig

     * @param MagentoFrameworkAppHttpContext $httpContext

     * @param array $data

     */

    public function __construct(

        MagentoFrameworkViewElementTemplateContext $context,

        MagentoCheckoutModelSession $checkoutSession,

        MagentoSalesModelOrderConfig $orderConfig,

        MagentoFrameworkAppHttpContext $httpContext,

        array $data = 

    ) {

        parent::__construct($context, $data);

        $this->_checkoutSession = $checkoutSession;

        $this->_orderConfig = $orderConfig;

        $this->_isScopePrivate = true;

        $this->httpContext = $httpContext;

    }



    /**

     * Render additional order information lines and return result html

     *

     * @return string

     */

    public function getAdditionalInfoHtml()

    {

        return $this->_layout->renderElement('order.success.additional.info');

    }



    /**

     * Initialize data and prepare it for output

     *

     * @return string

     */

    protected function _beforeToHtml()

    {

        $this->prepareBlockData();

        return parent::_beforeToHtml();

    }



    /**

     * Prepares block data

     *

     * @return void

     */

    protected function prepareBlockData()

    {

        $order = $this->_checkoutSession->getLastRealOrder();



        $this->addData(

            [

                'is_order_visible' => $this->isVisible($order),

                'view_order_url' => $this->getUrl(

                    'sales/order/view/',

                    ['order_id' => $order->getEntityId()]

                ),

                'print_url' => $this->getUrl(

                    'sales/order/print',

                    ['order_id' => $order->getEntityId()]

                ),

                'can_print_order' => $this->isVisible($order),

                'can_view_order'  => $this->canViewOrder($order),

                'order_id'  => $order->getIncrementId()

            ]

        );

    }



    /**

     * Is order visible

     *

     * @param Order $order

     * @return bool

     */

    protected function isVisible(Order $order)

    {

        return !in_array(

            $order->getStatus(),

            $this->_orderConfig->getInvisibleOnFrontStatuses()

        );

    }



    /**

     * Can view order

     *

     * @param Order $order

     * @return bool

     */

    protected function canViewOrder(Order $order)

    {

        return $this->httpContext->getValue(Context::CONTEXT_AUTH)

            && $this->isVisible($order);

    }



    /**

     * @return string

     * @since 100.2.0

     */

    public function getContinueUrl()

    {

        return $this->_storeManager->getStore()->getBaseUrl();

    }





    /**

    * @return string

    * getOrigId

    */

    public function getOrigId()

    {

        return $this->_checkoutSession->getLastRealOrder()->getEntityId();

    }



}

Then you can now get the Order Id(Entity Id) in your .phtml template like this:

$block->getOrigId()