custom-meta-box #6

// Save the Data
function page_save_custom_meta($post_id) {
    global $page_custom_meta_fields;
  
	// verify nonce
	if (!wp_verify_nonce($_POST['custom_meta_box_nonce'], basename(__FILE__))) 
		return $post_id;
	// check autosave
	if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
		return $post_id;
	// check permissions
	if ('page' == $_POST['post_type']) {
		if (!current_user_can('edit_page', $post_id))
			return $post_id;
		} elseif (!current_user_can('edit_post', $post_id)) {
			return $post_id;
	}
	
	// loop through fields and save the data
	foreach ($page_custom_meta_fields as $field) {
		if($field['type'] == 'tax_select') continue;
		$old = get_post_meta($post_id, $field['id'], true);
		$new = $_POST[$field['id']];
		if ($new && $new != $old) {
			update_post_meta($post_id, $field['id'], $new);
		} elseif ('' == $new && $old) {
			delete_post_meta($post_id, $field['id'], $old);
		}
	} // end foreach
}
add_action('save_post', 'page_save_custom_meta');