$appId = app()->getId(); // Returns a string like "Laravel_4f03a4c8d4e43"
$appId = $this->container->getParameter('kernel.project_id'); // Returns a string like "3d2a34da-38a9-4329-a3eb-16e0a12c3771"
$appId = Yii::app()->getId(); // Returns a string like "53c1b903459e2"In these examples, we can see that each framework has a slightly different way of accessing the application ID, but they all serve the same purpose. We can determine that the packages used in these examples are Laravel, Symfony, and Yii.