This is a complete waste of time when in minutes you could be running a vm with puphpet.com. Also upgrading has a high potential to trash the environment you use for other projects on your system. What are you going to do if you find a bug with an existing project and need to fix it? I doubt your production servers are running php 7. So you will either need to downgrade or just toss integrity out the window and hope your changes work on production with a completely different version of php.