redirect page to difference server in php

Does anyone kno开发者_StackOverfloww the code used for redirect page to difference server in PHP?

For example: I have 3 server here called server_1, server_2, server_3. and I would like to redirect a page abc.php to server_2. How should the code look like in php?

---

header("Location: http://server_2/abc.php");