如何获取函数中的值，该函数被检索并存储在同一类中的另一个函数的变量中 Magento 2

Question

Edit: I want to use $orderId value in other functions.

Here is class

<?php
namespace vendor\module\Observer;

use Magento\Framework\Event\ObserverInterface;

class Observer implements ObserverInterface
{
public function __construct(
    \Magento\Framework\Registry $registry
) { 
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
    }

public function execute(\Magento\Framework\Event\Observer $observer) { 
        $order = $observer->getEvent()->getOrder();
        $orderId = $order->getId();
        $customerId = $order->getCustomerId();
   }
public function getOrderId(){

    $Id = $orderId;
    return $Id;
}

}

I tried this:

class Observer implements ObserverInterface
{
public $orderId;
public function __construct(
    \Magento\Framework\Registry $registry
) { 
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
    }

public function execute(\Magento\Framework\Event\Observer $observer) { 
        $order = $observer->getEvent()->getOrder();
        this->$orderId = $order->getId();
        $customerId = $order->getCustomerId();
   }
public function getOrderId(){

    $Id = this->$orderId;
    return $Id;
}
}

I am Calling getOrderId(); in same class.. but not working

Gone through links like Making a global variable accessible for every function inside a class Need a solution in this particular scenario.

Answer 1

You should learn more about Object Oriented Concepts to understand what is Class, Object, Member variables, Member functions etc

Magento2 has a function to get last order id here:

$orderId = $this->checkout->getLastOrderId();

with $this->checkout is an instantiation of CheckoutSession

Regards