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    If you want to save power, you can also just run Homeassistant on a Raspberry (but at least Version 3), where you COULD also run a PHP Server.
    But i would highly advise you not to automate a smart home using PHP. Its a nice Language but just not the right tool for the job IMO.
    Homeassistant itself can run some nice scripts and Gira Homeserver also. I would recommend Gira Homeserver if you want to focus more on “established” solutions like KNX and HomeAssistant if you want to integrate many smarthome components like Shelly, your Smart Appliances, Hue/IKEA lights, Vacuum Robots and so on, Gira HS is a bit outdated on this front.