Edit report at http://bugs.php.net/bug.php?id=53534&edit=1
ID: 53534
User updated by: jstuckle at attglobal dot net
Reported by: jstuckle at attglobal dot net
Summary: Incorrect call to destructor when object stored in a
session
Status: Bogus
Type: Bug
Package: Class/Object related
-Operating System: Windows 7
+Operating System: Irrelevant
-PHP Version: 5.3.4
+PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
Additional information - the version and OS are irrelevant for this bugs
- it occurs in 5.2.x and 5.3.x versions on both Windows and Linux.
Also, the call to the destructor is invalid because the object is not
being destroyed; it is being saved in the session.
Previous Comments:
------------------------------------------------------------------------
[2010-12-13 04:00:43] jstuckle at attglobal dot net
This may be "expected behavior" - but it is a direct violation of OO
operations. By definition, after a call to the destructor the object is
in an undefined state. It is invalid to use this object again without
reinitializing it, i.e. calling a constructor.
It is also invalid to call a destructor on an uninitialized object, so
under correct operation, the destructor calls always have a 1-to-1
relationship with constructor calls.
------------------------------------------------------------------------
[2010-12-13 03:24:07] [email protected]
Expected behavior.
serialize(), unserialize(), __sleep(), __wakeup()
http://www.php.net/manual/en/language.oop5.magic.php#language.oop5.magic.sleep
http://php.net/serialize
http://php.net/unserialize
------------------------------------------------------------------------
[2010-12-13 01:57:16] jstuckle at attglobal dot net
Description:
------------
When an object is stored in the $_SESSION variable, the destructor is
still called at the end of the script. When the object is retrieved
from the $_SESSION on the next invocation, the constructor is not
called, but the destructor is again called.
To duplicate, place the attached code on a web server and load it. Then
press the reload button multiple times to see the results.
Test script:
---------------
<?php
class test {
private $construct_count = 0;
private $destruct_count = 0;
public function __construct() {
$this->construct_count++;
echo "Constructor called.<br>\n";
}
public function __destruct() {
$this->destruct_count++;
echo "Destructor called.<br>\n";
}
}
session_start();
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd";>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
<title>Test Script</title>
</head>
<body>
<?php
if (!isset($_SESSION['test'])){
echo "Session not found<br>\n";
$_SESSION['test'] = new Test();
}
else
echo "Session found<br>\n";
echo "<pre>\n";
print_r($_SESSION);
echo "</pre>\n";
?>
</body>
</html>
Expected result:
----------------
Session not found
Constructor called.
Array
(
[test] => test Object
(
[construct_count:test:private] => 1
[destruct_count:test:private] => 0
)
)
After second and subsequent invocations:
Session found
Array
(
[test] => test Object
(
[construct_count:test:private] => 1
[destruct_count:test:private] => 0
)
)
Actual result:
--------------
After first invocation:
Session not found
Constructor called.
Array
(
[test] => test Object
(
[construct_count:test:private] => 1
[destruct_count:test:private] => 0
)
)
Destructor called.
After second and subsequent invocations:
Session found
Array
(
[test] => test Object
(
[construct_count:test:private] => 1
[destruct_count:test:private] => 1
)
)
Destructor called.
Note: destruct_called increments on each invocation. construct_count
does not.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=53534&edit=1
