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Message-ID: <43678CA3.4070407@iamjochem.com>
Date: Tue, 01 Nov 2005 16:41:23 +0100
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To: Wez Furlong <kingwez@gmail.com>
Cc: Amin Azez <azez@ufomechanic.net>, internals@lists.php.net
References: <dk7vfe$m8k$1@sea.gmane.org> <4e89b4260511010723k5e06e7e1h7d2048a455721ae3@mail.gmail.com>
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Subject: Re: [PHP-DEV] === on objects fails with recursion! WTH?
From: jochem@iamjochem.com (Jochem Maas)

this is a php4-only problem right?
(or is the little test below insufficient to test the stated problem?)

THIS:
----------------------
php -r '
class A { public $b; function __construct(B $b) { $this->b = $b; $b->setA($this); } }
class B { public $a; function setA(A $a) { $this->a = $a; } }

$y = new B; $x = new A($y);
$z = $x;
$clone = clone $x;
var_dump(($x === $z), ($x === $clone), ($x == $z), ($x == $clone));
'

RETURNS (php5.0.4):
----------------------
bool(true)
bool(false)
bool(true)
bool(true)


Wez Furlong wrote:
> I proposed a patch to fix this a while back (at least a year ago).
> 
> --Wez.
> 
> On 11/1/05, Amin Azez <azez@ufomechanic.net> wrote:
> 
>>if ($object1===$object2)
>>
>>does a recursive check!
>>"Fatal error: Nesting level too deep - recursive dependency?"
>>Whats going on?
>>
>>I've go lots of object references all highly recursive and I just
>>sometimes need to check if two objects are the same object i.e. they
>>have the same storage address; I don't need to (and can't afford the
>>time) to recursively check every field.
>>
>>Is there a ==== instead that REALLY does what it seems === is trying to
>>fake, presumably to cover up all the object copying that is normally
>>going on but that I've managed to avoid?
>>
>>Sam
>>
>>--
>>PHP Internals - PHP Runtime Development Mailing List
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>>
>>
> 
>