PHP - 动态添加复选框时如何自动递增值和名称

Question

Good day! I would like to ask for help.

I'm currently making an Evaluation System for my school project. In my code, I can generate ALL the questions in my dbase together with 5 checkboxes.

e.g. If I add a new question to a particular criteria, it will be show to a table together with 5 auto-generated checkboxes.

how can I auto increment the name and value of my checkbox so if I save them to my dbase the value will be incremented every time there's a new question added?

I currently have 5 criterias, each have 5 questions and 5 sets of checkbox each. consisting of 25checkbox per criteria, but they have the same value and name when auto-generating.

<?php

        $sql = "SELECT * FROM question_pool_registrar WHERE criteria_id = 1";
        $result = $connect->query($sql);

        if($result->num_rows > 0){
            $nr = 0;
            while($row = $result->fetch_assoc()){
            $question = $row['question'];

                echo "<tr>
                <td>$question</td>
                <td><input type='checkbox' value=\"1c5".$nr."\" name=\"answer1".$nr."\" class='radio'></td>
                <td><input type='checkbox' value=\"1c4".$nr."\" name=\"answer1".$nr."\" class='radio'></td>
                <td><input type='checkbox' value=\"1c3".$nr."\" name=\"answer1".$nr."\" class='radio'></td>
                <td><input type='checkbox' value=\"1c2".$nr."\" name=\"answer1".$nr."\" class='radio'></td>
                <td><input type='checkbox' value=\"1c1".$nr."\" name=\"answer1".$nr."\" class='radio'></td>
                      </tr>";
                $nr++;
            }
        }

        ?>