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Wordpress - Add tags as classes? (post_class)
function tag_to_class($classes) {
        global $post;
        foreach((get_the_tags($post->ID)) as $tag)
            $tags[] = $tag->name;
            return $tags;
    }
    add_filter('post_class', 'tag_to_class');
    add_filter('body_class', 'tag_to_class');

<div class="<?php the_tags("", " ", "");?>">

<div class="<?php post_class(the_tags("", " ", "")); ?>">