How do I designate more than one category in this Wordpress hack?

am excluding comments from specific categories. However, when I try to exclude more than one, it doesn't work.

This works: <?php if (!in_category('7')) co开发者_开发问答mments_template(); ?>

This does not work:

<?php if (!in_category('7 , 9')) comments_template(); ?>

or

<?php if (!in_category('7')) comments_template(); ?> <?php if (!in_category('9')) comments_template(); ?>

Wordpress has a pretty decent documentation that is always worth looking into first. See Function Reference: in_category()

The function does not seem to accept multiple arguments, so you'll have to do this in PHP:

if ((!in_category('7')) and (!in_category('9')))

<?php
if ( !in_category('7') && !in_category('9') ) {
  comments_template();
}
?>