utf-8 bom and headers in php

Question

Possible Duplicate:
“Warning: Headers already sent” in PHP

When I create my php files with utf-8 bom, the header() function doesn't work because the bom chars are sent before the http headers.

• Does it mean that we shouldn't use bom in php source files?
• Is it a feature or bug?
• And what are your advices when working with utf-8 encoded php source files?

Answer 1

• The BOM is useless in UTF-8.
• It's neither. PHP is working as intended. Your file consists of this, and PHP is working as intended, because it outputs all data before the opening <?php tag first:

--

<byte order mark><?php // code here

--

• Don't use BOM.