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I’m writing a simple web app in PHP that needs to have write access to a directory on the server, if the directory isn’t writable I want to display an error message explaining to set the owner of the directory to whoever the webserver is being run as (eg. www-data, nobody) but as most people don’t know this it would be nice to be able to tell them who to chown the directory to. Is it possible to find this from PHP?
Check out shell_exec()