core/Mysql.php
public function dropTable(string $tbname)
    {
        $tbname = str_replace('@pf_', $this->prefix, $tbname);
        return $this->exec('DROP TABLE IF EXISTS ' . Mysql::escape($tbname) . ';');
    }
public function dropTable(string $tbname)
    {
        $tbname = str_replace('@pf_', $this->prefix, $tbname);
        return $this->exec('DROP TABLE IF EXISTS ' . Mysql::escape($tbname) . ';');
    }
删除表
@param string $tbname
@return int
@throws MysqlException