Add a form element using a button

[kashell]

I'm a little bit stumped at this problem.

 

Currently, I have a data driven form. The problem is that I need to have a way for the user to add this form as many times as the user needs.

 

I need the "add person" button at the end to add a duplicate version of the form below, *except* the name of the select element  needs to be unique since I'm storing the POST data in a 2d array.

 

I know I need to somehow loop through the data or increment some value to add another set of form elements... I'm just not sure how. Please help.

 

			$personquery = "SELECT personid, personfirstname, personlastname FROM person ORDER BY personlastname";
		$persondata = mysqli_query($dbc, $personquery);
		$rolequery = "SELECT roleid, roletitle FROM role ORDER BY roletitle";
		$roledata = mysqli_query($dbc, $rolequery);

			echo '<select id="person[]"name="person[????]">';
			while ($row = mysqli_fetch_array($persondata)) {
				echo '<option value="'. $row['person_personid'].'">' . $row['personlastname'] . ' ' . $row['personfirstname'] . '</option>';
			}
			echo '</select><br />';
			while ($row = mysqli_fetch_array($roledata)) {
				echo '<input type="checkbox" id="person[][]" name="role['.$row['roleid'].']['.$row['roleid'].']" value="'. $row['roleid'].'"/>' . $row['roletitle'] . ' ';
			}

			echo '<input type="submit" value="Add another person" name="add person"';