将iPhone应用程序(iOS SDK)连接到php / MySql后端的最佳方法是什么?

New to iPhone dev here. Just wondering what's the best way to connect an iPhone app frontend (based on Cocoa) to a php/MySql based backend?

The iPhone application will frequently access and change data stored on our server.

Many thanks

You will need to create a web service that will expose a set of APIs that are then use by your iPhone app to push/pull data. You may then choose to cache the data locally (on the iPhone) in a sqlite3 database. The most common data transfer formats are JSON and XML.