questa è la mia form

<form name="upload" enctype="multipart/form-data" method="post" action="upload.php">


Photo:

<input type="file" name="foto" size="70" /></p>


Photo1:

<input type="file" name="foto1" size="70" /></p>


Data1:

<input type="text" maxlength="50" size="50" name="data1"></p>


Data2:

<input type="text" maxlength="20" size="20" name="data2"></p>


Data3:

<input type="text" maxlength="10" size="10" name="data3"></p>


Data4:

<textarea class="box" rows="6" cols="30" name="data4"></textarea></p>

<input type="submit" value="Upload">
</form>


questo il php

<?php
$foto = $_POST['foto'];
$data1 = $_POST['data1'];
$data2 = $_POST['data2'];
$data3 = $_POST['data3'];
$data4 = $_POST['data4'];

quando eseguo lo script mi da
Notice: Undefined index: foto in C:\Program Files (x86)\EasyPHP 2.0b1\upload\upload.php on line 3
come mai me lo da solo con la variabile foto e non con le variabili data1...ecc...