Help with PHP File Upload Issue

I am attempting to upload files via. PHP 4.4.4. The
'$_FILES['update']['tmp_name'][0]' resolves to '/tmp/phpey9MpD', but
when I go to the /tmp dir. I do not see any php* file.
>
Could this be a issue with PHP or unix permissions for the web server?
>
Do I need to set an absolure dir. in the INI to make this work?
>
Confused as this works fine under another system with PHP 5.x.
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============== (the html upload form) ===============
<form
name="upload" action="admin_test.php" method="post"
enctype="multipart/form-data">
<input
type="hidden" name="what" value="process">
<table
cellpadding="2" cellspacing="0" border="0" width="90%" align="center">
<tr>
>
<td class="reg">1. </td>
>
<td class="reg"><input type="File" name="update[]" size="15"></td>
</tr>
<tr>
>
<td class="reg">2. </td>
>
<td class="reg"><input type="File" name="update[]" size="15"></td>
</tr>
<tr>
>
<td align="right">&nbsp;</td>
>
<td><input class="button" type="submit" name="loginbtn"
value="Upload"></td>
</tr>
</table>
</form>

'$_FILES['update']['tmp_name'][0]' resolves to '/tmp/phpey9MpD', but
when I go to the /tmp dir. I do not see any php* file.