title: Check whether checkbox question with multiple answers is correct using PHP?
body: <p>I have a html form that has a checkbox question where the correct answer is having two certain check boxes ticked. I want to use PHP to check whether the user has the correct answer and increment score variable by 1 (I know how to do the score part, but not how to check whether they have the right answer.) How can I do it?</p>
  
  <p>This is the HTML for the checkbox question, the correct answer is text and images.: </p>
  
  <pre><code>&lt;label &gt;What was Mosiac capable of displaying together?:
  &lt;input type="checkbox" name="question3" id="q3answer1" value ="answer1" checked="checked" /&gt;Videos
  &lt;input type="checkbox" name="question3" id="q3answer2" value ="answer2" /&gt;Text
  &lt;input type="checkbox" name="question3" id="q3answer3" value ="answer3" /&gt;Images&lt;/label&gt;
  </code></pre>