html - Retrieving a file name to attach to an email with SwiftMailer and PHP -

I am able to attach a file using swiftmailer, which is hardcoded but what if a file is uploaded to a user by the HTML form 'File is uploaded with input type control and should be sent with email via php script? How do I specify a filename in Swift Mailer?

Thank you! I'm quite sure that you get $ $ _FILES ['file'] ['tmp_name']