Exists installer written in pure php?

I search web for system written in php, a minimal version of universal professional install system like eg. nsis installer. I found nothing. Every web application written in php require eg. check valid php version, loaded php modules, set files access, configure db connection etc. If i want give end user zip that user uncompress in web folder and run eg. install.php I write quickly, simple but buggy script that make required things. I thing about make something uniwersal but if someone that system written why rethink again.
Rob
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