Building a chat app with a PHP MySQL backend means you need to create and manage your own database, write custom code to send and retrieve messages, and handle real-time communication, which can be tricky and take a lot of time. On the other hand, you can go with solutions like MirrorFly that gives you a ready-made chat solution with features like real-time messaging, unlimited file sharing, voice/video calls, and live streaming, all without needing to worry about managing the backend or servers. While PHP gives you more control and customization, MirrorFly makes the development process faster, easier, and more secure, helping you launch a full-featured chat app quickly.