Use PHP to mail messsage with 1 or more attachments

Need to modify PHP function to mail message with 1 to 5 attachements that are PDF. Attached is the basic function that needs to be modified to send the message with the attached PDFs. I attached a couple pdf's to use for testing. Whatever the main message body is, is the cover page of the fax, so the attached coversheet file replaces some fields and makes it a coversheet.. Then any attached files are the actual body.