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Posted by Jochem Maas on 05/28/05 01:58
Philip Hallstrom wrote:
> Hi all -
> I came across a very odd bug in 4.3.10 (and 4.3.11). It's not in
> 4.3.4, and it's not in 5.0.4.
>
looks like a problem related to copy-on-change strategy php uses (that
is when a copy is made its only actually copied if and when you change the copy, until
then its a really reference. if I understand it correctly)
> My understanding is that in 4.x objects are assigned by value. So, why
> in the first part of the code is the output of serialize() indicating a
> reference? This would suggest that objects are being copied by reference.
>
> But in the second when I change $ary[1]->name, the output of the
> serialize only changes the second element, not both. Also, changing
> $obj->name doesn't have any effect on $ary[0] or $ary[1]. Which would
> suggest that $ary[0] and $ary[1] are NOT the SAME thing.
>
> The output below is from 4.3.11. 4.3.4 does not have this problem and
> the serialize() output does not indicate any reference.
>
> In 5.0.4, the everything works like I'd expect it to since objects are
> assigned by reference.
>
> It's almost like $obj is partially being copied by reference and that
> serialize is picking up on that or something...
>
> Should I submit this as a bug? Am I missing something obvious?
>
> Here's the code:
>
> <?php
>
> $obj->name = "Homer";
> $ary[] = $obj;
> $ary[] = $obj;
>
> $obj1->name = "Homer";
> $ary[] = $obj1;
>
> print_r($ary);
> print("\n");
> print ( serialize($ary) );
>
> print("\n\n---------------------------------------\n\n");
>
> unset($obj); unset($obj1); unset($ary);
>
> $obj->name = "Homer";
> $ary[] = $obj;
> $ary[] = $obj;
>
> $obj1->name = "Homer";
> $ary[] = $obj1;
>
> $ary[1]->name = "Marge";
>
> print_r($ary);
> print("\n");
> print ( serialize($ary) );
>
> ?>
>
> Here's the output:
>
> Array
> (
> [0] => stdClass Object
> (
> [name] => Homer
> )
>
> [1] => stdClass Object
> (
> [name] => Homer
> )
>
> [2] => stdClass Object
> (
> [name] => Homer
> )
>
> )
>
> a:3:{i:0;O:8:"stdClass":1:{s:4:"name";s:5:"Homer";}i:1;r:2;i:2;O:8:"stdClass":1:{s:4:"name";s:5:"Homer";}}
>
>
> ---------------------------------------
>
> Array
> (
> [0] => stdClass Object
> (
> [name] => Homer
> )
>
> [1] => stdClass Object
> (
> [name] => Marge
> )
>
> [2] => stdClass Object
> (
> [name] => Homer
> )
>
> )
>
> a:3:{i:0;O:8:"stdClass":1:{s:4:"name";s:5:"Homer";}i:1;O:8:"stdClass":1:{s:4:"name";s:5:"Marge";}i:2;O:8:"stdClass":1:{s:4:"name";s:5:"Homer";}}
>
>
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