PHP类与对象中的private访问控制的疑问

代码如下:

class Bar 
{ 
public function test() { 
$this->testPrivate(); 
$this->testPublic(); 
} 
public function testPublic() { 
echo "Bar::testPublic\n"; 
} 
private function testPrivate() { 
echo "Bar::testPrivate\n"; 
} 
} 
class Foo extends Bar 
{ 
public function testPublic() { 
echo "Foo::testPublic\n"; 
} 
private function testPrivate() { 
echo "Foo::testPrivate\n"; 
} 
} 
$myFoo = new foo(); 
$myFoo->test(); // Bar::testPrivate 
// Foo::testPublic 
 
为啥第一行会

输出Bar::testPrivate呢？
一些资料： 
//www.gxlcms.com/article/31709.htm
还有php官网上，关于这段代码的贡献者回复中，也找到了一条：
http://www.php.com/manual/zh/language.oop5.visibility.php#87413