Update + Migrate, Dating Website, Php 4 to Php5

I have a dating website which was custom designed a four years ago. It uses Php 4 and Mysl 4. I want to migrate this domain to a new server, which uses all current OS and software, including Php 5, Mysql 5, etc. Needed is a contractor to A. upgrade the dating website's scripts, as needed, in order that it will perform properly, compliant with the upgraded software at its new server. B. test fully C. once ready, migrate the domain's database, to its new home.