how to add some ( Yahoo Messenger )plug-in using php and codeigniter

[eluser]dmorin[/eluser]
It's very hard to do this outside of Jabber/XMPP as all of the other networks use proprietary protocols that aren't implemented well across languages.

One thing you can checkout is http://sourceforge.net/projects/phurple/. This uses the LibPurple engine which drives Pidgin and Adium chat apps, but it's still in Alpha.

Another is to find a jabber server with yahoo transports and setup a bot.

Or, look at things like http://www.php121.com/ which you may be able to dissect and get what you need out of it.

Good luck, and if you do have success, post back here so we know.