Our server currently runs PHP installed as CGI in Apache on Cent-OS.
What are the advantages/possible problems with upgrading from 5.2.17 to 5.3? My dedi host says that it will most likely break my sites, but hasn't given any actual things that could break.
Our server is 98% WordPress with a bunch of custom functionality. Where can I find a list of deprecated/changed functions, changed format, etc.