<?phpabstract class Food{    private $cups;    protected $apples;    protected $water;    function __construct(){        $this->cups = static::getCups();//static 也可以调用其他static修饰的函数        $this->apples = static::getApple();        $this->water = $this->getWater();    }    static function create(){        return new static();    }    static function getCups(){        return ‘debault‘;    }    static function getApple(){        return "apple";    }    protected function getWater(){        return "water";    }}class People extends Food{    static function getCups(){        return "Please give me a big bottles";    }    static function getApple(){        return "Please give me a big apple";    }    }echo "<pre>";$app = People::create();var_dump($app);var_dump($app::getCups());echo "</pre>";?>