How to combine these two php codes into one

This a wrong script and basically I'm trying to combine them into one using the && thingy but I can't quite make it work.

<?php

if (is_archive()) {
<meta name="robots" content="noindex, nofollow" />;
}

elseif (is_category()) {
<meta name="robots" content="noindex, nofollow" />;
}
?>

Code (markup):

 

Have you tried the || thingy?

 

No. How do I do that? Do I just do

<?php
if (is_archive()) || (is_category()) {
<meta name="robots" content="noindex, nofollow" />;
}
?>

Code (markup):

 

Remove one closing parentheses before the || thingy, and the opening parentheses after the thingy.

 

if (is_archive() && is_category())

Code (markup):

The above will only be true if both conditions are met, while

if (is_archive() || is_category())

Code (markup):

will be true if any of the conditions are met

 

Holy shit I just leveled up