PHP checkbox dynamic name and retrieve correctly

I have a quiz and one quiz have multiple checkbox questions. How to make all the checkbox name differently so I can retrieve correctly?

Html:

foreach($questionSetArr as $question){
$questionID = $question['question_id'];
           $getListOfOptions = getOptionsList($questionID);
           foreach($getListOfOptions as $option){
               $optionDesc =  $option['option_desc'];
               echo "<div class='checkbox'>
               <label><input type='checkbox' value='$optionDesc' name='cb[$questionID]' id='$questionID' >$optionDesc</label>
               </div>";    
           }
}

PHP:

$questionID = $qIDArr[$x];
    echo "<br>User Answer for Question $questionID  : ";
                $selectedQuestion= $_POST["cb"];
        print_r($selectedQuestion);     
                foreach ($selectedQuestion as $sQ){
                    echo $sQ;
            }

Currently, they will retrieve wrongly. How to solve it ?