title: Array variable is being removed from session in PHP
body: <p>I'm storing the value of my multiselect combo in session.</p>
  
  <pre><code>&lt;select id="abc" name="abc[]" multiple="multiple"&gt;
  &lt;option value="select"&gt;Select&lt;/option&gt;
  &lt;option value="first"&gt;first&lt;/option&gt;
  &lt;option value="second"&gt;second&lt;/option&gt;
  &lt;option value="third"&gt;third&lt;/option&gt;
  &lt;option value="fourth"&gt;fourth&lt;/option&gt;
  &lt;/select&gt;
  
  $_SESSION['abc']=$_POST['abc'];
  </code></pre>
  
  <p>I'm getting the correct value of the session variable in the same file, but I have a 3-step signup process so in the 3rd step I'm getting all other variables except this value of the multiselect combo.</p>
  
  <p>Also I'm not getting the value of one checkgroup (again because it is an array variable).</p>
  
  <p>Do any one have any ideas about this?</p>