echo "<script>location.href='www.google.es';</script>"; //Nos lleva a Google

http://www.jose-campos.com/prueba/temperaturas.txt

http://www.jose-campos.com/prueba/recogerdatos.php?dato1=aosdnks&dato2=sdasd

<?php
readfile ("http://www.jose-campos.com/prueba/temperaturas.txt")
?>

<?

$fecha=time();
$dato1 = $_GET['dato1'];
$dato2 = $_GET['dato2'];

$fff = fopen("temperaturas.txt","a"); //no es a+ porque queremos que se actualicen

$salida = "<br><table width='449' border='1' cellpadding='2' cellspacing='1' bordercolor='#000000' bgcolor='#FFFFFF'>
  <tr>
    <td width='137' rowspan='3'><div align='center'>$fecha</div></td>
  </tr>
  <tr>
    <td><div align='center'>$dato1</div></td>
  </tr>
  <tr>
    <td><div align='center'>$dato2</div></td>
  </tr>
</table>";

fwrite($fff, $salida);
fclose($fff);

echo "<script>location.href='www.google.es';</script>"; //Nos lleva a Google
?>

http://www.tupagina.com/recogerdatos.php?dato1=30&dato2=233

Option Explicit
Public Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" (ByVal sAgent As String, ByVal lAccessType As Long, ByVal sProxyName As String, ByVal sProxyBypass As String, ByVal lFlags As Long) As Long
Public Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" (ByVal hInternetSession As Long, ByVal sURL As String, ByVal sHeaders As String, ByVal lHeadersLength As Long, ByVal lFlags As Long, ByVal lContext As Long) As Long
Public Declare Function InternetReadFile Lib "wininet.dll" (ByVal hFile As Long, ByVal sBuffer As String, ByVal lNumBytesToRead As Long, lNumberOfBytesRead As Long) As Integer
Public Declare Function InternetCloseHandle Lib "wininet.dll" (ByVal hInet As Long) As Integer

Public Const IF_FROM_CACHE = &H1000000
Public Const IF_MAKE_PERSISTENT = &H2000000
Public Const IF_NO_CACHE_WRITE = &H4000000
     
Private Const BUFFER_LEN = 256


Public Function ActualizarDatos(dato1 As String, dato2 as string) as string
    Dim sBuffer As String * BUFFER_LEN, iResult As Integer, sData As String
    Dim hInternet As Long, hSession As Long, lReturn As Long

    'get the handle of the current internet connection
    hSession = InternetOpen("vb wininet", 1, vbNullString, vbNullString, 0)
    'get the handle of the url

    dim sURL as string
    sURL = "http://www.tupagina.com/recogerdatos.php?dato1="&dato1&"&dato2="&dato2

    If hSession Then hInternet = InternetOpenUrl(hSession, sURL, vbNullString, 0, IF_NO_CACHE_WRITE, 0)
    'if we have the handle, then start reading the web page
    If hInternet Then
        'get the first chunk & buffer it.
        iResult = InternetReadFile(hInternet, sBuffer, BUFFER_LEN, lReturn)
        sData = sBuffer
        'if there's more data then keep reading it into the buffer
        Do While lReturn <> 0
            iResult = InternetReadFile(hInternet, sBuffer, BUFFER_LEN, lReturn)
            sData = sData + Mid(sBuffer, 1, lReturn)
        Loop
    End If
 
    'close the URL
    GetUrlSource = sData
End Function

ActualizarDatos(500,36) //Por ejemplo

<?php
readfile ("http://www.tupagina.com/temperaturas.txt")
?>