title: wordpress - POST multiple select value as an array for custom meta box
body: <p>I am using wordpress 3.5. I create a custom post type and a custom metabox where i use a html multi select menu</p>
  
  <pre><code>&lt;select data-placeholder="Choose available colors..." class="chosen_multi" name="available_colors[]" id="available_colors" multiple="multiple"&gt;
  ....
  ....
  &lt;/select&gt;
  </code></pre>
  
  <p>i use bellow code to save select value</p>
  
  <pre><code>update_post_meta($id, 'available_colors', strip_tags($_POST['available_colors']));
  </code></pre>
  
  <p>But i know it not store multi value as array in Database.</p>
  
  <p>How i store array (available_colors[]) by <code>update_post_meta</code>, Not want to use <strong>php implode explode</strong></p>