代碼如下:

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 

為啥第一行會輸出Bar::testPrivate呢？ 
還有php官網上，關于這段代碼的貢獻者回復中，也找到了一條： 
http://www.php.net/manual/zh/language.oop5.visibility.php#87413