title: get selected multiple value in textarea
body: <p>I have a db_field (shortcode) that returns a string when submited query. the value from that return is AB,EF,GH (exactly this!</p>
  
  <p>The second part is that i have a textarea with a list of that shortcodes. So i trying to highlight (selected) the same macthed elements.
  for example:</p>
  
  <pre><code>$String_in_Database = AB,EF,GH;
  </code></pre>
  
  <p>Wish to have that:</p>
  
  <pre><code>&lt;select name="Country[]" id="Country" multiple="multiple" size="5"&gt;
  &lt;option value="AB" selected&gt;AB&lt;/option&gt;
  &lt;option value="CD"&gt;CD&lt;/option&gt;
  &lt;option value="EF" selected&gt;EF&lt;/option&gt;
  &lt;option value="GH" selected&gt;GH&lt;/option&gt;
  ......
  &lt;/select&gt;
  </code></pre>
  
  <p>This is how i generate the options:</p>
  
  <pre><code>&lt;?php $MyArray = $settingsUser['set_disallowcountries']; ?&gt;
  &lt;?php foreach($disallCountry as $key =&gt; $value) { ?&gt;
  &lt;option value="&lt;?php echo $value['short'] ?&gt;" &lt;?php if(is_array($value['short'], $MyArray)) { echo 'selected'; }?&gt;&gt;&lt;?php echo $value['long'] ?&gt;&lt;/option&gt;
  &lt;?php } ?&gt;
  </code></pre>