受保护的继承后可以访问，私有的只能在该类中访问，不会被继承访问 class Man{
      protected $name='lee';//受保护     private    $age=123;//私有     function __construct(){
          echo $this->name;//lee         echo $this->age;//123     } } class Girl extends Man{
      function __construct(){
          echo $this->name;//lee         echo $this->age;//不会出现123,     } } new Man(); new Girl();

     name;//lee        echo $this->age;//123    }}class Girl extends Man{    function __construct(){        echo $this->name;//lee        echo $this->age;//不会出现123,    }}new Man();new Girl();