PHP - Enviar archivo a url

With CreateObject("MSXML2.XMLHTTP")

    .Open "POST", sUrl, bAsync

     user = "bassco"

     pass = "2019bassco"

    .setRequestHeader "Authorization", "Basic " + Base64Encode(user + ":" + pass)

    .setRequestHeader "Content-Type", "multipart/form-data; boundary=" & STR_BOUNDARY

    .send pvToByteArray(sPostData)

    If Not bAsync Then

        pvPostFile = .statusText

    End If

End With