#34931 [NEW]: Problem maintaining membeprivacy while returning private member array variable.
| From: | feralcab at gmail dot com | Date: | Thu, 20 Oct 2005 13:21:48 +0000 |
| Subject: | #34931 [NEW]: Problem maintaining membeprivacy while returning private member array variable. | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-86807@lists.php.net to get a copy of this message | ||
From: feralcab at gmail dot com
Operating system: FreeBSD 5.4
PHP version: 5.0.5
PHP Bug Type: Arrays related
Bug description: Problem maintaining membeprivacy while returning private member array variable.
Description:
------------
When an object contains an array of other objects
as a private member variable, if the array is
returned through a member method, instead of a
copy a reference to the private array is returned.
Through this reference the member variable can be
modified outside of the object's scope. Thus, violating the private member
variable state.
Reproduce code:
---------------
class Atom {
private $x = 0;
public function __construct($x) {$this->x = $x;}
public function setX($x) {$this->x = $x;}
}
class Element {
private $atoms = array();
public function __construct($NMAX) {
for ($i=0; $i<$NMAX; ++$i)
$this->atoms[] = new Atom($i);
}
public function setAtoms($atoms) {$this->atoms = $atoms;}
public function getAtoms() {return $this->atoms;}
}
$element = new Element(3);
$v = $element->getAtoms(); print_r($v);
$v[0]->setX(79); print_r($v);
$w = $element->getAtoms(); print_r($w);
Expected result:
----------------
Array
(
[0] => Atom Object
(
[x:private] => 0
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
Array
(
[0] => Atom Object
(
[x:private] => 79
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
Array
(
[0] => Atom Object
(
[x:private] => 0
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
Actual result:
--------------
Array
(
[0] => Atom Object
(
[x:private] => 0
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
Array
(
[0] => Atom Object
(
[x:private] => 79
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
Array
(
[0] => Atom Object
(
[x:private] => 79
)
[1] => Atom Object
(
[x:private] => 1
)
[2] => Atom Object
(
[x:private] => 2
)
)
--
Edit bug report at http://bugs.php.net/?id=34931&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34931&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34931&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34931&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=34931&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=34931&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=34931&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=34931&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=34931&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=34931&r=support
Expected behavior: http://bugs.php.net/fix.php?id=34931&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=34931&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=34931&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=34931&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34931&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=34931&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=34931&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=34931&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=34931&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=34931&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=34931&r=mysqlcfg