PHP Code to Send File to Trello via REST API

I'd like a PHP code that receive some file from a cliente program (postman, for example). This file could be with any extension (zip, rar, png, etc) and I want to create a card on trello and put this file as attachement. I don't want to save the file in my server and then send the URL to trello, I want to send the file as attachment, so it will be save at trello server.