class method visibility

I read the manual about method visibility, but i can't understand the code below: <?php 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(); $myFoo->test(); // Bar::testPrivate // Foo::testPublic ?> in class Bar's method test, why "$this->testPrivate();" invoked testPrivate method of class Bar, but not the testPrivate of class Foo? here $this shoud be the reference of the instance of class Foo, isn't it? -- JeremyWei（魏志锋，字静之） Mob: 18914495716 新浪微博：@JeremyWei QQ: 327493482 Home: www.weizhifeng.net Less is more