Bug #69873 [Com]: Weird behavior with serialize(debug_backtrace()) and __sleep
| From: | ftdysa at gmail dot com | Date: | Thu, 18 Jun 2015 18:49:51 +0000 |
| Subject: | Bug #69873 [Com]: Weird behavior with serialize(debug_backtrace()) and __sleep | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-193667@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=69873&edit=1
ID: 69873
Comment by: ftdysa at gmail dot com
Reported by: ftdysa at gmail dot com
Summary: Weird behavior with serialize(debug_backtrace()) and
__sleep
Status: Open
Type: Bug
Package: Class/Object related
Operating System: Debian 6.0.10
PHP Version: 5.6.10
Block user comment: N
Private report: N
New Comment:
On further review, this is probably expected behavior.
changing sleep to:
public function __sleep() {
return ['obj'];
}
Returns the expected result.
I must say that this is a rather weird side effect..
Previous Comments:
------------------------------------------------------------------------
[2015-06-18 14:15:10] ftdysa at gmail dot com
Description:
------------
I am seeing weird behavior that I believe was introduced by this patch:
https://bugs.php.net/bug.php?id=69210
It seems that if you call serialize(debug_backtrace()) where the backtrace contains an object with a
__sleep method that returns a non-string (in this case, an array containing a member variable of
that object), the member variable is overridden with the __toString representation of that object.
That's a bit confusing to understand but I hope my example code will illustrate it better.
Test script:
---------------
<?php
class Obj {
public function __construct($mix) {
foreach ($mix as $k => $v) {
$this->$k = $v;
}
}
public function __toString() {
$str = '';
foreach ($this as $k => $v) {
$str = "$k => $v\n";
}
return $str;
}
}
class A {
public $obj;
public function setObj($obj) {
$this->obj = $obj;
}
public function getObj() {
return $this->obj;
}
function __sleep() {
return ['test' => $this->obj];
}
}
function printA(A $a) {
var_dump($a);
serialize(debug_backtrace(0));
}
$obj = new Obj(['hello'=>'there']);
$a = new A();
$a->setObj($obj);
var_dump($a->getObj());
printA($a);
var_dump($a->getObj());
Expected result:
----------------
object(Obj)#1 (1) {
["hello"]=>
string(5) "there"
}
object(A)#2 (1) {
["obj"]=>
object(Obj)#1 (1) {
["hello"]=>
string(5) "there"
}
}
object(Obj)#1 (1) {
["hello"]=>
string(5) "there"
}
Actual result:
--------------
object(Obj)#1 (1) {
["hello"]=>
string(5) "there"
}
object(A)#2 (1) {
["obj"]=>
object(Obj)#1 (1) {
["hello"]=>
string(5) "there"
}
}
string(15) "hello => there"
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=69873&edit=1