Changing linux and smb password with PHP

[Anon]

Guys,
I have some PHP scripts in my intranet, acessing my INFORMIX databases with the user and passwords found in /etc/passwd. I need to make a script that provide the user to change his/her password but I don't know how can I do that. Could anyone help me? Is there a PHP function that can change this file and the /etc/smbpasswd too?

Any help will be apreciated.

[sglane]

You need to have a sufficiently running your webserver who is able to write to /etc/shadow /etc/passwd etc. This user is generally root. This is very dangerous. If you feel your scripts and your servers are secure enough, run apache as root. Otherwise, look to a different way to do system tasks.