在非AWS服务器上远程访问MySQL EC2 Instance for PHP应用程序

I am developing a PHP application that needs to access MySQL (EC2 Instance) remotely from my machine (or any IP for that matter). The application needs to be a stand alone, meaning if tunnel is necessary then the application needs to be able to do that. Currently I am using the below code for connecting to MySQL:I am developing a PHP application that needs to