Simple WordPress function to check current “page” type

<?php
function current_page_type() {
    if (is_category()) {
        return 'category';
    } elseif (is_tag()) {
        return 'tag';
    } elseif (is_404()) {
        return '404';
    } elseif (is_post_type_archive()) {
        return 'archive';
    } elseif (is_page()) {
        return 'page';
    } else {
        return 0;
    }
}
?>

You can of course adjust the above code to echo the results when you call the function.