hi

When i delete an user, i want to be deleted all of private messages and comments of that user. can any people helping me ?

You can only do that manually using a MySQL management tool like phpMyAdmin or MySQLFront. ANd you will have to write the MySQL queries yourself too. Probably something like:
DELETE * WHERE uid=[insert user ID of user you want to delete all posts from], in the correct tables. I'm no developer tho, so don't use this as an example, especially on a live website.

Herko

some code ?

private messages would need something like:

in phpmyadmin:

DELETE * FROM xoops_priv_msgs WHERE to_userid = <id>

replace XOOPS in the table name with the prefix from your XOOPS install (leave as XOOPS if you haven't changed it) and then replace <id> with the user id of the user you deleted.. so it looks something like:

DELETE * FROM xoops_priv_msgs WHERE to_userid = 5 <this will remove all priv msgs from the users inbox with uid=5>

for the comments >

DELETE * FROM xoops_xoopscomments WHERE com_uid = <uid>

i don't know the full implications and whether other things may link to/from them, so it would be best to try this on a test server before doing it on a production site..