php 3 to 5 upgrade: foreach loop no longer working

I've recently upgraded a server from Fedora Core 3 to Core 5 in the process php had been upgraded from either 3 or 4 to php 5. In doing so I had to do a major overhaul of a web site as many things stopped working (.i.e $HTTP_POST_VAR, etc). Haven't gotten through most of that I know have a problem with a page that is being submitted to another page which contains different values for checkboxes. I would pull the values from each checkbox using a foreach loop as such: foreach ($checkbox as $value) { echo "Value: $value<br />\n"; } however the value is no longer being echoed to the page. What am I missing here? This is the code that is being submitted, $num being an incremented value: <input name="checkbox[<?php echo $num; ?>]" type="checkbox" id="checkbox[<?php echo $num; ?>]" value="<?php echo $row_rsADS['customers_id']; ?>" /> Thanks in advance