running CI/PHP app on LAMP

Most servers run on Linux, not Windows, so unless you had Windows Remote Desktop access to NewHost server, it was most probably a LAMP setup.

But that's ok, because all the important stuff is in the AMP part - Apache, MySQL, PHP. And that's exactly the same code running either Win or Linux.

Like jreklund said, the big difference between Windows and Linux environments is that on Linux, file names are case sensitive. Also on Linux the file read/write is a lot stricter, so when you've built app that needs to handle file uploads, it'll need a tiny bit more config on server, but nothing major.

I'd say, unless absolutely necessary, keep working locally on WAMP, but go with LAMP on server.