framework/db/Schema.php
protected function getCacheTag()
    {
        return md5(serialize([
            __CLASS__,
            $this->db->dsn,
            $this->db->username,
        ]));
    }
protected function getCacheTag()
    {
        return md5(serialize([
            __CLASS__,
            $this->db->dsn,
            $this->db->username,
        ]));
    }
protected function getCacheTag ( ) { return md5 ( serialize ( [ __CLASS__ , $ this -> db -> dsn , $ this -> db -> username , ] ) ) ; }
Returns the cache tag name.
This allows [[refresh()]] to invalidate all cached table schemas.
@return string the cache tag name
Returns the cache tag name . This allows [[ refresh () ]] to invalidate all cached table schemas .