To remake the site under the latest PHP

There is a website that was made on the fifth of PHP, but need it to run on a new, and as a result, a whole bunch of Error-s.

Your task will be to fix all the bugs that the site started working without any errors and such things that interfere with the normal operation of the website

You will be presented with the entire source code of the website, as well as the base

Write your suggestions and how much time is willing to do