Hi Ray, thank you for your reply.
I checked PHP versions and they are:
Mamp: 5.5.26
Terminal: 5.5.38
Browser: 5.6.29
None of them says that I use php7...
Still tho, I could start using MySQLi, what would be the fastest solution? Can I use MySQLi Server Behaviors on top of my shopping site with mysql?
Rika