class MyDataObject extends DataObject { protected function onBeforeDelete() { // Perform any necessary actions before the object is deleted // For example: delete related objects, update status fields, etc. } }One use case of the onBeforeDelete method is to delete related objects when an object is deleted. For instance, if a user is deleted, all of their associated posts should also be deleted. This can be accomplished by calling the delete() method on the related objects inside onBeforeDelete. Another use case is to update status fields in other objects when an object is deleted. For example, if a product is deleted, the stock levels of associated warehouses could be updated to reflect that the product is no longer in stock. In conclusion, the onBeforeDelete method is a useful function provided by the PHP DataObject library that enables developers to perform necessary actions before an object is deleted from a database.