joshuahornby on "Select certain tags to display instead of all tags."

I am displaying all the tags by using this function

<?php
$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;
?>

This then prints out all the tags.

Instead of display all tags is there a way I can say which tags I wish for it to display the slug and link to? So for example I can only display a tag called 'hello'