public function run()
{
$tags = Tag::findTagWeights();
$str = '';
foreach ($tags as $tag => $weight) {
$link = Html::a(Html::encode($tag), Yii::$app->getUrlManager()->createUrl(['main/default/index', 'tag' => $tag]));
$str .= Html::tag('span', $link, ['class' => 'tag', 'style' => "font-size:{$weight}pt"]) . "\n";
}
return $this->render('tag', ['title' => $this->title, 'content' => $str]);
}