PHP hypermedia app (HTMX), without framework or dependencies

Hello! I created a simple example of how to build a quite capable PHP app with HTMX, simple template rendering (PHP is already kind of a templating language!) some error / exception handling and other goodies. This is more of an experiment then something useful, but it is one of the few server side languages that I could build all of this without any framework. Less moving parts and more hypermedia fun.