This is slightly off-topic, but here it goes...

I have testing and production web servers running cPanel and 5 PHP developers. Up to this point, we haven't used any version control. I want to introduce Subversion, but I don't know the best way to integrate it into our workflow. I'd love to hear your suggestions.

Currently:
  1. Developer stores files on testing server and modifies them via file sharing.
  2. Client reviews files on testing server and approves.
  3. Developer pushes files to production server via FTP.
Proposed:
  1. Developer checks files out of (new) svn server, modifies them locally, commits them to repository.
  2. Post-commit trigger updates files on testing server.
  3. Client reviews files on testing server and approves.
  4. Developer uses svn export to update production server.
Would this PHP workflow work well?