I have a number of small sites with php and mysql coding that need to be upgraded. If you do well on one I'll get you to do all of them. I had a bunch of sites moved to a new server that only has mysql 5 and now some functions don't work. I know it's mostly fairly simple stuff, but I don't have the patience for it.
Quote on a per site basis. Most of the sites just have simple calendar, or news posting code. Some have simple CMS.
Errors like "User with that ID doesn't exist"
where the code is no longer connecting to the mysql database.