common\services\PostService::contentTweet PHP Method

    public static function contentTweet($content, $model)
    {
        $content = static::contentReplaceAtUser($content, $model);
        $content = static::contentReplaceTag($content);
        return $content;
    }

 public function beforeSave($insert)
 {
     if (!parent::beforeSave($insert)) {
         return false;
     }
     $this->content = PostService::contentTweet($this->content, $this);
     return true;
 }