Fixing website php syntax issues

I recently moved my website [[login to view URL]][1] to a new server, my backend content system that was custom made for me a few years back has syntax issues because of the newer php version on the new server, I just need someone who can edit the various bits of code that need editing to allow the backend features to function normally. There isn't allot of work here as most things work, its just little things like editing and deleting and few other small things..