If statement for catergories

I was wondering if someone could explain how to roughly code this into php:

if catergory = Cars && user is unregistered
<my code>
else
<my code>

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  1. <?php
    
        $current_user = wp_get_current_user();
    
        if ( is_category( 'Cars' ) && 0 == $current_user->ID ) { ?>
    
    <!-- HTML markup here -->
    
    <?php } else { ?>
    
    <!-- other HTML markup here -->
    
    <?php } ?>
    

    ID will be 0 in the $current_user object, if the user isn’t logged in.

    Related reading:

    EDIT

    Try using is_user_logged_in() and in_category() instead:

    <?php
    if ( in_category( 'cars' ) && ! is_user_logged_in() ) {
        // Current post is in the category 'cars'
        // and the current user is NOT logged in;
        // do something
    } else {
        // do something else
    }
    ?>