There seems to be a problem with using an array as a file upload name:

<?php
echo $foo[bar];
?>
<FORM ACTION="<?php echo $PHP_SELF; ?>" METHOD="POST" ENCTYPE="multipart/form-data">
<INPUT TYPE="FILE" NAME="foo[bar]">
<INPUT TYPE="submit">
</FORM>

Doesn't work - this would be very useful since I need to pass either foo[$VAR] or $(foo_$VAR)
so that I can differentiate and neither seem possible.