alexx855

<?php 

add_action( '{taxonomy}_add_form_fields', 'add_feature_group_field', 10, 2 );
function add_feature_group_field($taxonomy) {
    global $meta_name;
    ?>

    <div class="form-field">
      <label for="meta_name">Meta Name</label>
      <input name="meta_name" id="meta_name" type="text" value="<?php echo $meta_name; ?>" size="40" aria-required="true">

alexx855

<?php 

add_filter( 'wp_nav_menu_items', 'your_custom_menu_item', 10, 2 );
function your_custom_menu_item ( $items, $args ) {
    if (is_single() && $args->theme_location == 'primary') {
        $items .= '<li>Show whatever</li>';
    }
    return $items;
}