Send pdf to a WebService (.Net) from Php

Good morning,

I need to send a .pdf file from a web made in php

This is the code I use to send from c #:

WebClient.UploadDataAsync(new Uri("http://" + Properties.Settings.Default.WebService 
             + "/Service1.svc/UploadFile?FileName=" + vrNamePDF), "POST", btFile.ToArray());

I would need a similar method for Php.