Php -issue php7 push it back to 5.6

Thank you but i got so frustrated that I just started all over again. OK new question for you. Everything was woking well but for some reason, and I don’t remember setting up a password for the encryption now it asking me for a pass word , that I dont remember setting up. So my new question is if I delete the data file will I still be able to log back in as the admin or first users.