How to add post classes?

function imageHolder($id){
    $category  = get_the_category($id);
    $class=""category-" . strtolower($category[0]->cat_name) . '"';
    print <<<HTML
    <div class=$class>
       This is a Test
    </div>
    HTML;
}
imageHolder('1');

Please be careful about using ‘/n’ or ‘/r’ symbol in the Heredoc syntax(they might cause the function does not work properly).

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