ID: 25975
User updated by: reiersol at online dot no
Reported By: reiersol at online dot no
Status: Closed
Bug Type: Zend Engine 2 problem
Operating System: Linux RedHat 9.0
PHP Version: 5CVS
New Comment:
For the record: I don't think this bug has been fixed, and I think it's
a very serious one, but I'm giving up.
Previous Comments:
------------------------------------------------------------------------
[2004-01-11 11:00:25] [EMAIL PROTECTED]
Seems to be fixed now.
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[2003-12-04 09:52:38] reiersol at online dot no
OK. Here is an example using sessions. Exactly the same thing happens.
<?php
class Bar { public $value = 0; }
class Foo {
public $v1;
public $v2;
function Foo() {
$this->v1 = new Bar;
$this->v2 = $this->v1;
}
}
session_start();
if (isset($_SESSION['g'])) {
//Try these two one at a time to see the different behaviors:
// $_SESSION['g']->v2 = "I'm no longer an object";
$_SESSION['g']->v2->value = 42;
} else {
$_SESSION['g'] = new Foo;
}
?>
<pre>
<?php
var_dump($_SESSION['g']);
?>
</pre>
------------------------------------------------------------------------
[2003-11-28 20:40:06] [EMAIL PROTECTED]
Please provide an example script that actually uses sessions,
(it's not the same thing when you do the serialize/unserialize inside
the same script..)
------------------------------------------------------------------------
[2003-11-10 05:48:59] reiersol at online dot no
Thanks, but I'm afraid this is not quite good enough.
What I'm getting now after serialize/unserialize is:
object(foo)#3 (2) {
["v1"]=>
&object(bar)#4 (1) {
["value"]=>
string(42) "and now for something completely different"
}
["v2"]=>
&object(bar)#4 (1) {
["value"]=>
string(42) "and now for something completely different"
}
}
The ampersands occur only after serialization. They indicate that this
is what is known as a reference in PHP 4, which is a symbol table
alias. The objects still don't behave the same before and after. Try
this:
$f->v2 = 'I\'m no longer an object';
$g->v2 = 'I\'m no longer an object';
var_dump($f);
var_dump($g);
As before, $f is the object before serialize/unserialize, $g is the
object after. The output is:
object(foo)#1 (2) {
["v1"]=>
object(bar)#2 (1) {
["value"]=>
int(42)
}
["v2"]=>
string(23) "I'm no longer an object"
}
object(foo)#3 (2) {
["v1"]=>
&string(23) "I'm no longer an object"
["v2"]=>
&string(23) "I'm no longer an object"
}
As I understand it, in $f we are replacing an object reference with a
string. In $g, we are replacing the value of a variable that's aliased
to another.
You might ask whether this has any practical consequences. I think that
sooner or later it will (in fact, it seems to be happening in my
full-scale example). When it does, it will be very confusing to the
people who encounter the problem. You may get away with this for a
while, but the longer you get away with it the more difficult it might
be to figure out.
------------------------------------------------------------------------
[2003-11-09 12:34:43] [EMAIL PROTECTED]
Please try using this CVS snapshot:
http://snaps.php.net/php5-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php5-win32-latest.zip
This should be fixed in CVS now.
------------------------------------------------------------------------
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the rest of the comments, please view the bug report online at
http://bugs.php.net/25975
--
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