title: Zend Multiselect Element is posting only one selected values
body: <p><strong>I am creating multiple select element like this and it is showed successfully on form:</strong></p>
  
  <pre><code>$element = new Zend_Form_Element_Multiselect('clinics');
  $element-&gt;setLabel("Clinics");
  $element-&gt;setAttrib( 'style','width: 240px' );
  $element-&gt;setMultiOptions( array( '1'=&gt;'clinic1', '2'=&gt;'clinic2' ) );
  </code></pre>
  
  <p><strong>After rendering above element it shows the following html in html source:</strong></p>
  
  <pre><code>&lt;select name="clinics[]" id="clinics" multiple="multiple" style="width: 240px" size="5" class="required" tabindex="41"&gt;
      &lt;option value="1" label="clinic1"&gt;clinic1&lt;/option&gt;
      &lt;option value="2" label="clinic2"&gt;clinic2&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p><strong>But when I submit the form with two selected fields and print_r the result like this:</strong></p>
  
  <pre><code>    $request = $this-&gt;getRequest();
      $form = new Patient_Form_Patient( $formOptions );
  
      if ( $request-&gt;isPost() ) {
          if ( $form-&gt;isValid( $request-&gt;getPost() ) ) {
              $values = $form-&gt;getValues();
              print_r($values);die();
          }
      } 
  </code></pre>
  
  <p><strong>It stores only first selected option in array but not all selected elements:</strong></p>
  
  <pre><code>Array
  ( 
      [clinics] =&gt; Array
          (
              [0] =&gt; 1
          )
  
      [save] =&gt; Submit
  )
  </code></pre>
  
  <p><strong>Can someone help that how can I submit multiple values ?</strong></p>