Bug #52245 [Opn]: Private member of parent class accessible from child class.
Edit report at http://bugs.php.net/bug.php?id=52245&edit=1
ID: 52245
Updated by: johan...@php.net
Reported by:phpamid at gmail dot com
Summary:Private member of parent class accessible from child
class.
Status: Open
Type: Bug
Package:*General Issues
Operating System: Windows 7 x64
PHP Version:5.3.2
Block user comment: N
New Comment:
Private enforces encapsulation, a key element of OOP. The current
behavior ensures you can extend the class without an effect on
show_private_member() and whatever happens in there. With your change
extending the class can hae an effect (by accident) on the method.
Previous Comments:
[2010-07-27 09:43:48] phpamid at gmail dot com
Could you please answer to my questions?
[2010-07-14 09:25:32] phpamid at gmail dot com
1) Answer for your question "Are you looking for protected elements?" is
"Bug #52245 Private member of parent class accessible from child
class."
2) Why you say that show_private_member() belongs to Parent class, if it
is inherited by its Child? In addition, I redefined the private member
in Child class - then, according to the paradigm of OOP polimoryizm, the
method should return a value of Child private member, otherwise all you
have said is contrary to OOP, in particular, to polymorphism.
[2010-07-08 13:00:41] johan...@php.net
You are calling show_private_member(). That method belongs to Father and
therefore has access to Father's private elements. The method has no
access to other class's private elements. Are you looking for protected
elements?
[2010-07-04 15:11:05] phpamid at gmail dot com
as for your code:
class A
{
private $a = "a";
}
class B extends A
{
private $a = "b"; // is this an error?
}
i think every class has own private member, so there is no error.
Ok, I got you.
I hope that this issue will be clarified.
Thank you for discussion.
[2010-07-04 14:32:12] giorgio dot liscio at email dot it
in fact if you use protected instead of private it works as expected
but the "private" issue should be clarified, i think
* i'm sorry for the second post
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--
Edit this bug report at http://bugs.php.net/bug.php?id=52245&edit=1
Bug #52245 [Opn]: Private member of parent class accessible from child class.
Edit report at http://bugs.php.net/bug.php?id=52245&edit=1
ID: 52245
User updated by: phpamid at gmail dot com
Reported by: phpamid at gmail dot com
Summary: Private member of parent class accessible from child
class.
Status: Open
Type: Bug
Package: *General Issues
Operating System: Windows 7 x64
PHP Version: 5.3.2
New Comment:
as for your code:
class A
{
private $a = "a";
}
class B extends A
{
private $a = "b"; // is this an error?
}
i think every class has own private member, so there is no error.
Ok, I got you.
I hope that this issue will be clarified.
Thank you for discussion.
Previous Comments:
[2010-07-04 14:32:12] giorgio dot liscio at email dot it
in fact if you use protected instead of private it works as expected
but the "private" issue should be clarified, i think
* i'm sorry for the second post
[2010-07-04 14:26:04] giorgio dot liscio at email dot it
sure i know i don't need to override the method with the same one in the
new class to fix this problem
in the parent class the field is private... so theoretically i can not
access the member in the derived class
class A
{
private $a = "a";
}
class B extends A
{
private $a = "b"; // is this an error?
}
it probably is, and maybe php should throw an error
[2010-07-04 14:00:51] phpamid at gmail dot com
.
class Son extends Father{private $x = 'SON';
// try to decomment this:
//public function a(){echo $this->x;}
}
.
I know if I override method a() in the child - everything will be ok,
but it's not necessary to override method a(), because method a() is
inherited form father class and it's public.
p.s. if it's a bug, then it's php behavior.
[2010-07-04 13:50:26] giorgio dot liscio at email dot it
i think that is a bug but i'm not sure if is a php behavior
x;}
}
class Son extends Father{private $x = 'SON';
// try to decomment this:
//public function a(){echo $this->x;}
}
$son_instance = new Son;
$son_instance->a();
?>
[2010-07-04 13:22:18] phpamid at gmail dot com
Description:
my_private_member;
}
}
class Son extends Father {
private $my_private_member = 'Son private member';
}
//After init Son object, it has both private members, we can see it if
we
var_dump($son_instance);
$son_instance = new Son;
//Following manual php.net the output "Son private member" is expected
here, but
the result is "Father private member"
$son_instance->show_private_member();
?>
Test script:
---
my_private_member;
}
}
class Son extends Father {
private $my_private_member = 'Son private member';
}
//After init Son object, it has both private members, we can see it if
we var_dump($son_instance);
$son_instance = new Son;
//Following manual php.net the output "Son private member" is expected
here, but the result is "Father private member"
$son_instance->show_private_member();
?>
Expected result:
Expected "Son private member".
--
Edit this bug report at http://bugs.php.net/bug.php?id=52245&edit=1
Bug #52245 [Opn]: Private member of parent class accessible from child class.
Edit report at http://bugs.php.net/bug.php?id=52245&edit=1
ID: 52245
User updated by: phpamid at gmail dot com
Reported by: phpamid at gmail dot com
Summary: Private member of parent class accessible from child
class.
Status: Open
Type: Bug
Package: *General Issues
Operating System: Windows 7 x64
PHP Version: 5.3.2
New Comment:
.
class Son extends Father{private $x = 'SON';
// try to decomment this:
//public function a(){echo $this->x;}
}
.
I know if I override method a() in the child - everything will be ok,
but it's not necessary to override method a(), because method a() is
inherited form father class and it's public.
p.s. if it's a bug, then it's php behavior.
Previous Comments:
[2010-07-04 13:50:26] giorgio dot liscio at email dot it
i think that is a bug but i'm not sure if is a php behavior
x;}
}
class Son extends Father{private $x = 'SON';
// try to decomment this:
//public function a(){echo $this->x;}
}
$son_instance = new Son;
$son_instance->a();
?>
[2010-07-04 13:22:18] phpamid at gmail dot com
Description:
my_private_member;
}
}
class Son extends Father {
private $my_private_member = 'Son private member';
}
//After init Son object, it has both private members, we can see it if
we
var_dump($son_instance);
$son_instance = new Son;
//Following manual php.net the output "Son private member" is expected
here, but
the result is "Father private member"
$son_instance->show_private_member();
?>
Test script:
---
my_private_member;
}
}
class Son extends Father {
private $my_private_member = 'Son private member';
}
//After init Son object, it has both private members, we can see it if
we var_dump($son_instance);
$son_instance = new Son;
//Following manual php.net the output "Son private member" is expected
here, but the result is "Father private member"
$son_instance->show_private_member();
?>
Expected result:
Expected "Son private member".
--
Edit this bug report at http://bugs.php.net/bug.php?id=52245&edit=1
