public function myObserver(Varien_Event_Observer $observer) { $eventData = $observer->getData('myEventData'); //Do something with the $eventData }
public function myObserver(Varien_Event_Observer $observer) { $product = $observer->getProduct(); $oldPrice = $product->getOrigData('price'); $newPrice = $product->getPrice(); //Do something with the prices }In this example, the `Varien_Event_Observer` object contains a reference to a `Mage_Catalog_Model_Product` object, which is passed to the observer as an argument. The observer then extracts some data from the product object using its `getOrigData` and `getPrice` methods. Overall, the `Varien_Event_Observer` class is an essential part of the Magento development process, as it enables developers to respond to events triggered by the system and perform custom actions based on the data passed to those events.