Sending Array Data in a POST

What I am trying to do is have a form that when a user selects a category, then a sub category expands. In the subcategories, they can select any checkbox representing data that they want to be carried over to the next page. I tried to name the checkbox with a number incrementation concatenated behind it. But then I wasn't sure what to do with it on the next page and how to assign it to a variable when I didnt' know the exact name. So if someone can tell me how to do that, that would be great.

Otherwise, I think I have to use an array. But I am not too sure what I am doing wrong with it. I have a loop on my page that puts data into an array called commarray. Then I have a hidden field at that has this array data assigned to it.

In the form this is what I have:

for($i = 0; $i < $commrows; ++$i)
{
      $commline = odbc_fetch_array($commresult);
        ?>
               <input type='checkbox' name='<?PHP echo 'commtopic'.$i ?>' value='<?PHP echo $commline[Topic] ?>' ><?PHP echo $commline[Topic]; ?> <br>
      <div id="<?PHP echo $num ?>" class="switchcontent"><blockquote>
      <?PHP
      $commarray = array($i => '$commline[Topic]');
      ?>
      </blockquote></div>            
      <?PHP
}
?>
<input type='hidden' name='commarray' value='<?PHP echo $commarray ?>'>

On the next page, I have the following:

$commarray = $_REQUEST['commarray'];
$arraycount = count($commarray);
//I get an error on this - Warning: array_values(): The argument should be an array in /data/www/html/EROS/ReviewVariables.include on line 21
$arrayvalues = array_values($commarray);
print "<br>$arrayvalues";

print "<br>$commarray"; //Prints 'Array'
print "<br>$arraycount"; //Prints '1' (when their should be 7)
print "<br>$commarray[0]"; //Prints 'A' - I am not sure where it is getting A from - it is supposed to be a sentence


So I am not sure why this array is not getting passsed to the next page properly. What am I donig wrong?

Thanks
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