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    copied!<p>You can add metabox to custom post type with following code.</p> <p>First, create metabox</p> <pre><code>add_action('admin_init', 'my_theme_on_admin_init'); function my_theme_on_admin_init() { add_meta_box('my_metabox', __('My metabox', 'textdomain'), 'my_metabox_render', 'my_custom_post_type', 'normal', 'high' ); } </code></pre> <p>Notice, that <code>my_custom_post_type</code> is a name of you custom post type and <code>my_metabox_render</code> - name of a function that renders metabox.</p> <p>Rendering function should create all nessesary fields </p> <pre><code>function my_metabox_render($post) { $data = get_post_meta($post-&gt;ID, '_meta_key', true); // Use nonce for verification wp_nonce_field('add_my_meta', 'my_meta_nonce'); ?&gt; &lt;div class="inside"&gt; &lt;table class="form-table"&gt; &lt;tr valign="top"&gt; &lt;th scope="row"&gt;&lt;label for="my_meta_value"&gt;&lt;?php _e('My meta', 'textdomain'); ?&gt;&lt;/label&gt;&lt;/th&gt; &lt;td&gt;&lt;textarea id="my_meta_value" name="my_meta_value" cols="40" rows="5"&gt;&lt;?php echo (isset($data)) ? $data : ''; ?&gt;&lt;/textarea&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;?php } </code></pre> <p>Than you should update you metadata when user saves post</p> <pre><code>add_action('wp_insert_post', 'save_my_meta', 10, 2); function save_my_meta($id) { if ( defined('DOING_AUTOSAVE') &amp;&amp; DOING_AUTOSAVE ) return $id; if (!current_user_can('edit_posts')) return; if (!isset($id)) $id = (int) $_REQUEST['post_ID']; if (isset($_POST['my_meta_value']) &amp;&amp; wp_verify_nonce($_POST['my_meta_value'], 'add_my_meta')) { $data = $_POST['my_meta_value']; if (isset($data)) { update_post_meta($id, '_meta_key', $data); } else { delete_post_meta($id, '_meta_key'); } } } </code></pre>
 

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