How to check if on multiple address checkout page?

Question

I need a way to check if the customer is using multiple checkout.

Answer 1

Depending from where to check it you can either use Mage::app()->getRequest() or if available (like in controllers) $this->getRequest() ...

$request = Mage::app()->getRequest();

if ($request->getModuleName() == 'checkout' && $request->getControllerName() != 'onepage')
# or
if ($request->getModuleName() == 'checkout' && $request->getControllerName() == 'multishipping')

Answer 2

If customer is using multiple checkout then the URL of the website would be different then the normal checkout..

Multiple Checkout

https://www.domain.com/checkout/multishipping/

Normal Checkout

https://www.domain.com/checkout/onepage/

You can identify it by URL. Thanks :)