How to get Current Logged Account Information using Connect PHP Script

Summary:

Currently, I'm creating Custom scripts using PHP in File Manager. The purpose of this script is to capture the audit log or history of changes on Custom Object that have been changed by the LoggedIn Account. For example, if Account A is changing some data field value for a Custom Object the Script will capture the history of changes(Such as, who changes the data, when the data is changed, and what data changed).

Please help, Thank You.