Which course should I choose if I want to learn PHP? My goal is to build a host computer system that collects data from the host computer PLC for display. At the same time, the host computer can also send parameters to the host computer. In this case, which courses should I take, front-end or back-end? Also, I would like to ask, can PHP exchange data with PLC?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
