php私有成员private的程序题目

class base
{
  private $member;

  function __construct()
  {
      echo __METHOD__ . "(begin)
";
    $this->member = 'base::member';
    $this->test();
      echo __METHOD__ . "(end)
";
  }

  function test()
  {
      echo __METHOD__ . "
";
    print_r($this);
  }
}

class derived extends base
{
  public $member = 'derived::member (default)';

  function __construct()
  {
      echo __METHOD__ . "(begin)
";
      parent::__construct();
      parent::test();
    
      $this->test();
    $this->member = 'derived::member';
      echo __METHOD__ . "(end)
";
  }

  function test()
  {
      parent::test();
      echo __METHOD__ . "
";
    print_r($this);
  }
}

$t = new derived();
$t->test();
unset($t);

打印结果为：

derived::__construct(begin)
base::__construct(begin)
base::test
derived Object
(
    [member] => derived::member (default)
    [member:base:private] => base::member
)
derived::test
derived Object
(
    [member] => derived::member (default)
    [member:base:private] => base::member
)
base::__construct(end)
base::test
derived Object
(
    [member] => derived::member (default)
    [member:base:private] => base::member
)
base::test
derived Object
(
    [member] => derived::member (default)
    [member:base:private] => base::member
)
derived::test
derived Object
(
    [member] => derived::member (default)
    [member:base:private] => base::member
)
derived::__construct(end)
base::test
derived Object
(
    [member] => derived::member
    [member:base:private] => base::member
)
derived::test
derived Object
(
    [member] => derived::member
    [member:base:private] => base::member
)
Done