MySQL upgrade from 5.0 to 5.7

Job ID: 34523687

Budget: £250 – £750 GBP

My website - happybirthdaytoyou.com - is running on MySQL version 5.0 - This is going to be upgraded to version 5.7 it is possible that the old code (from at least 15 years ago) will not work with this version of MySQL.

I need to know what errors are going to occur and whether the website will continue to work.

I need the MySQL code on my site to be changed if needed.

This work needs to be done as soon as possible as the upgrade is imminent.