php / NIS

[Jonathan B.]

hi all !
Is there anyone here who can help with NIS. I must use NIS with php
and I dont even know how NIS work.
I know there's a lot of functions in php:

yp_all -- Traverse the map and call a function on each entry
yp_cat -- Return an array containing the entire map
yp_err_string -- Returns the error string associated with the given
error code
yp_errno -- Returns the error code of the previous operation
yp_first -- Returns the first key-value pair from the named map
yp_get_default_ domain -- Fetches the machine's default NIS domain
yp_master -- Returns the machine name of the master NIS server for a
map
yp_match -- Returns the matched line
yp_next -- Returns the next key-value pair in the named map.
yp_order -- Returns the order number for a map

I must interrogate NIS with a username and get the password for this
username.
Which one I am going to use ? What I am going to get from this
function, the password, all the profile for this user, ... ??

Thank you so much for your help
Jonathan B.