Change class by log in status with Thesis

May 29, 2011

While I was re-styling the display of my comments, I wanted to be able to differentiate whether a user was logged in to WordPress or not. I didn’t want to muck around with Thesis’ PHP code and potentially break a future upgrade, so I used a WordPress filter to add class="logged_in" or class="logged_out" to the <body> tag.

function add_login_body_classes($classes) {
    if (is_user_logged_in()) {
        $classes[] .= 'logged_in';
    } else {
        $classes[] .= 'logged_out';
    }

    return $classes;
}

add_filter('thesis_body_classes', 'add_login_body_classes');

Add this to your Thesis’ custom_functions.php file.

The code is seriously simple. The add_login_body_classes function takes the existing classes Thesis was going to add to <body> and adds either logged_in or logged_out depending on the user’s status. The add_filter function adds it to the WordPress filter processor to get processed.