PHP & Multiple checkboxes
<p>I have this form:</p>

<pre><code>    &lt;form action="" method="post"&gt;
  &lt;input type="checkbox" name="a" value="2" /&gt; 
  &lt;input type="checkbox" name="b" value="4" /&gt;
&lt;input type="submit" name="submit" value="Submit" /&gt;
    &lt;/form&gt;
</code></pre>

<p>What i need, when checkbox/es is/are selected and submit button is pressed to calculate value </p>

<ul>
<li>if this value is more or equivalent - query</li>
<li>if this value is less - error message</li>
</ul>

<p>Value is checked from column name points</p>

<p>Thank you.</p>
