[Mediawiki-l] How to figure out wherer the link red or not?

[Juriy Katkov]

Hello, everyone!
I'm writing an extension now where I have to know for the given link whether
it's red or not. How can I easily do that? I read some articles like that :
http://meta.wikimedia.org/wiki/Help:Page_existence and see how can I check
existence as user.
Is there any function to check page existence from my php-code?
Thanks in advance!
Yury