How to get customer id from guest checkout

Question

is there any way to get customer id from guest checkout?

Answer 1

Use below code to get guest email using email you can identify customer id

private $session;
protected $_customer;
protected $_storemanager;

public function __construct(
    .....
    \Magento\Customer\Model\CustomerFactory $customer,
    \Magento\Store\Model\StoreManagerInterface $storemanager,
    \Magento\Checkout\Model\Session $session,
    ...
) {
    ...
    $this->session = $session;
    $this->_customer = $customer;
    $this->_storemanager = $storemanager;
    ....
}

public function getCustomerIdFromQuote() {
     $guestEmail = $this->session->getQuote()->getCustomerEmail();
     $websiteID = $this->_storemanager->getStore()->getWebsiteId();
     $customer = $this->_customer->create()->setWebsiteId($websiteID)->loadByEmail($guestEmail );
     $customerId = $customer->getId();

}