[PHP] SSH Authentication using php

[Teren]

Hi, what my goal is is to be able to authenticate a user by they SSH acount on the 
system using php. I tried looking on google, but didn't see anything with ssh. What 
i've tried to do is use the exec() and just do:

exec("ssh [EMAIL PROTECTED]".escapleshellard("password"));

but that didn't seem to work. Any ideas? 

Thanks
Teren