Show current tag

Hello,

I’m looking for a list of all tags with a special class on the current one.

I found this code which works great but I can’t manage to add the special class…

$tags = get_tags();
$html = '<div class="post_tags">';
foreach ( $tags as $tag ) {
	$tag_link = get_tag_link( $tag->term_id );

	$html .= "<a href='{$tag_link}' title='{$tag->name} Tag' class='{$tag->slug}'>";
	$html .= "{$tag->name}</a>";
}
$html .= '</div>';
echo $html;

Any help ?

Thanks a lot !