PHP and IRC

Hi everybody, I have a tricky problem to expose here :
I'm developping a website for an IRC community, and I'm willing to add a special feature to it : allow the users that post a comment to have their IRC nickname printed in the adequate textbox.
The only problem is that I have absolutely no idea on how to do that. I'm used to IRC, having bots etc... but I don't know how to do that, indeed the ircg php module doesn't seem adequate for my problem because it would need a connection each time an user posts a comment, slowing the site A LOT.
So I was thinking of using an eggdropp bot, but now again I've never had the opportunity to touch one so I don't know, maybe there are some free services that do that already ? And what's the command to get a nickname from an IP ?

Thanks for reading

Hi Wolverine,
I think the best thing to do would be to check the IRC RFC (request for comments) page. Just goto google.com and search for "IRC RFC"... it will list the commands that you need to use to accomplish what you're after.

That can be pretty hard to do, because most users have the user-mode +i on by default. When users are +i, you can not find the nick from an IP without being on the same channel as them.

To get the nick from an IP, you can use the /who command (in mIRC).