我建议使用OOP构造，而不是运行到trac并抱怨缺少功能：

// File: base.class.php
abstract class wpse67649_admin_page_base
{
    public function add_page()
    {
        add_submenu_page( 
             null            // -> Set to null - will hide menu link
            ,\'Page Title\'    // -> Page Title
            ,\'Menu Title\'    // -> Title that would otherwise appear in the menu
            ,\'administrator\' // -> Capability level
            ,\'menu_handle\'   // -> Still accessible via admin.php?page=menu_handle
            ,array( $this, \'render_page\' ) // -> To render the page
        );
    }

    // Must get defined in extending class
    abstract function render_page();
}

// File: ___sub_page.class.php
class wpse67649_render_sub_page extends wpse67649_admin_page_base
{
    public function __construct()
    {
        add_action( \'admin_init\', array( $this, \'add_page\' ) );
    }

    public function render_page()
    {
        // You have access to every $this->class_var from your parent class
        ?>
<div class="wrapper>
    <!-- do funky page rendering -->
</div>
        <?php
    }
}

简单地说，因为回调足以执行任何操作，包括加载文件。：）对于那些已经不仅可能而且微不足道的事情，把逻辑复杂化是不值得的。