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    <p>I think it actually would be a good idea to save as a custom field, only one that doesn't show up in the custom field box. You can accomplish the latter by adding a "_" at the beginning of the custom field's name (i.e. "_my_custom_field" instead of "my_custom_field".</p> <p>Here's a sample function to save your meta box data. I changed the names to match the code you have above.</p> <p>:</p> <pre><code> &lt;?php function blc_save_postdata($post_id){ // Verify this came from the our screen and with proper authorization, // because save_post can be triggered at other times if ( !wp_verify_nonce( $_POST['blc_noncename'], plugin_basename(__FILE__) )) { return $post_id; } // Verify if this is an auto save routine. If it is our form has not been submitted, so we dont want // to do anything if ( defined('DOING_AUTOSAVE') &amp;&amp; DOING_AUTOSAVE ) return $post_id; // Check permissions to edit pages and/or posts if ( 'page' == $_POST['post_type'] || 'post' == $_POST['post_type']) { if ( !current_user_can( 'edit_page', $post_id ) || !current_user_can( 'edit_post', $post_id )) return $post_id; } // OK, we're authenticated: we need to find and save the data $blc = $_POST['backlink_url']; // save data in INVISIBLE custom field (note the "_" prefixing the custom fields' name update_post_meta($post_id, '_backlink_url', $blc); } //On post save, save plugin's data add_action('save_post', array($this, 'blc_save_postdata')); ?&gt; </code></pre> <p>And that should be it. I used this page as a reference: <a href="http://codex.wordpress.org/Function_Reference/add_meta_box" rel="nofollow">http://codex.wordpress.org/Function_Reference/add_meta_box</a></p>
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