How do I specify more than one category?

Question

I 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')) comments_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(); ?>

Answer 1

I would suggest using category slugs instead of ids. Please try something like this:

if ( ! in_category( array( 'bunnies', 'tacos', 'banana-pirates' ) ) ) {
    comments_template();
}

Answer 2

Put the IDs into an array, like this:

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