I have an iPhone app out that stores data on the device. I want to create an app with user accounts like Instagram, Path, Foursquare, Gowalla, etc.
Thus, I think I will need to create an iPhone client app, a MYSQL database, and PHP/Ruby on Rails to connect the two, along with the RestKit Framework for Objective-C.
Are there any good books you guys would recommended for the backend stuff? I am comfortable with the iOS part, but have no history with the backend/webserver side.
For learning PHP (I’m assuming you’re new to PHP?) I recommend PHP Solutions by David Powers. For Ruby on Rails, check out Ruby on Rails 3 Tutorial by Michael Hartl.