I'm working with the PHPToolkit to connect to SuiteTalk from Netsuite, and I need to get the standard and custom fields.
The unique way I found is get one previously created on netsuite, get the record and extract the fields. But must be other way to get the Object Structure
It sounds like you are trying to get the object definitions for NetSuite objects. If so, you will need to make use of the WSDL as a web reference, found here: NetSuite WSDL
I am not sure how this is done with PHP and which IDE you are working in. I am sure you can search online for how to add web references to your project in whichever dev environment you are working.