HI Folks,
Hope all is well with you all.
A general question if I may. I have a number of older carts running 1.5, 1.5.1, 1.5.3.
Recently my hosting company upgraded my php version to 7.3 which to a number of my carts down for PHP errors.
Call to undefined function: mysql_connect(). Please install the MySQL Connector for PHP

Having them revert the PHP version back to 5.4 brought them back. They warn of security problems with 5.4 and suggest getting it back to 7.3 as soon as possible. Is there any changes I can make to the existing carts to accept 7.3?
As always thanks for the help.