PHP insanity

I was moving a site from development into test environment with git today and kept getting this error:

	Warning: Cannot modify header information - headers already sent by (output started at /xxxxx/domain.com/system/expressionengine/config/config.php:2)

I'm no PHP developer (I know enough to get by with ExpressionEngine) but I couldn't see anything wrong with my syntax and the site worked perfectly fine on development.

Turns out there was a line break on the opening line (the 2 in the warning helped) which was causing the site to have a total spaz.

So this short post is as much a reminder for myself than anything.