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class Father
{
protected $salutation = "Hello there!"; //問(wèn)候

public function getSalutation()
{
print("$this->salutationn");
$this->identify();
}

protected function identify()
{
print("I am Father.
n");
}
};

class Son extends Father
{
protected $salutation = "Hey!"; //父類(lèi)中的protected $salutation 被覆寫(xiě)

protected function identify() //父類(lèi)中的protected identify() 被覆寫(xiě)
{
print("I am Son.
n");
}
};

$obj = new Son();
$obj->getSalutation(); //輸出Hey! I am Son.
?>

class Father
{
private $salutation = "Hello there!";

public function getSalutation()
{
print("$this->salutationn");
$this->identify();
}

private function identify()
{
print("I am Father.
n");
}
}

class Son extends Father
{
private $salutation = "Hey!";
private function identify()
{
print("I am Son.
n");
}
}

$obj = new Son();
$obj->getSalutation(); //輸出Hello there! I am Father.
?>

class User //用戶(hù)
{
protected function isAuthorized() //是否是驗證用戶(hù)
{
return(FALSE);
}

public function getName() //獲得名字
{
return($this->name);
}

public function deleteUser($username) //刪除用戶(hù)
{
if(!$this->isAuthorized())
{
print("You are not authorized.
n");
return(FALSE);
}

//delete the user
print("User deleted.
n");
}
}

class AuthorizedUser extends User //認證用戶(hù)
{
protected function isAuthorized() //覆寫(xiě)isAuthorized()
{
return(TRUE);
}
}

$user = new User;
$admin = new AuthorizedUser;

//not authorized
$user->deleteUser("Zeev");

//authorized
$admin->deleteUser("Zeev");
?>