Rename MySQL tables

for PHP 7 and higher (uses mysqli functions)

* Leave "OLD prefix" blank to add a new prefix to all the tables in the database.

* Leave "NEW prefix" blank to remove a prefix from all the tables.

* In both prefixes include all symbols like "_" or "-" etc. since that will be a substring to search and replace.

* Be carefull about spaces!

* Test before do!!!
Server address:
Database name:
Database user:
User password:
OLD prefix:
NEW prefix:
Test before execute