php私有成员private的程序题目

class base
{
  private $member;

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

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

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

  function __construct()
  {
      echo __METHOD__ . "(begin)\n";
      parent::__construct();
      parent::test();

      $this->test();
    $this->member = 'derived::member';
      echo __METHOD__ . "(end)\n";
  }

  function test()
  {
      parent::test();
      echo __METHOD__ . "\n";
    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