This document provides an overview of how to configure and use AppDynamics to monitor various aspects of a PHP application architecture, including error monitoring, SQL queries, HTTP requests, transactions, distributed transactions, external services, and more. It describes viewing and analyzing performance metrics, transactions, call graphs, and other diagnostic data to identify bottlenecks and issues. Configuration options are presented for instrumenting the PHP application, databases, queues, external APIs and other components to provide end-to-end performance monitoring of the distributed application.