gistfile1.php

class User_Model_User extends User_Model_Base_User
{

  const IS_ACTIVE_OFF = 0;

  const IS_ACTIVE_ON  = 1;

  public static $isActiveFlag = self::IS_ACTIVE_OFF;

  public function hook()
  {
      if (self::$isActiveFlag)
      {
          //filter here 
      }
  }
 
   
}

class UserController 
{

   public function indexAction()
   {
       User_Model_User::$isActiveFlag = User_Model_User::IS_ACTIVE_ON;
       $active_users = $this->_User->findAll();

       User_Model_User::$isActiveFlag = User_Model_User::IS_ACTIVE_OFF;
       $inactive_users = $this->_User->findAll();

   }
}