Question: how to use a wired xbox 360 controller on ps3?
Answer: Use an Adapter. There are some Adapters on the market (like the XCM which Blem mentioned) which may be pretty pricy, but let you use your Xbox-pads on your PS3. ... 
Use an cheaper 3rd party gamepad. A second way to play on your PS3 with an Xbox-like pad is to buy 3rd partie hardware which can be used on your PS3.