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Date: Tue, 25 Mar 2003 17:52:32 -0800
To: Jan Schneider <jan@horde.org>
Cc: internals@lists.php.net
In-Reply-To: <1048601587.22f84c63a1eac@jan.dip.ammma.net>
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Subject: Re: [PHP-DEV] ZE2 race condition
From: zeev@zend.com (Zeev Suraski)
References: <1048601587.22f84c63a1eac@jan.dip.ammma.net>

That's quite intentional - assignments in ZE2 are handle based, versus the 
value based in ZE1.  That's more or less the biggest change in ZE2 :)

If you want to create copies like in ZE1 you can use __clone().

Zeev

At 06:13 25/03/2003, Jan Schneider wrote:
>Running the following code:
>
>class Foo {
>   var $bar_ref;
>}
>
>class Bar {
>   var $foo_ref;
>}
>
>$foo = new Foo();
>$bar = new Bar();
>$foo->bar_ref = $bar;
>$bar->foo_ref = $foo;
>
>var_dump($foo);
>var_dump($bar);
>
>$s = serialize($foo);
>var_dump($s);
>$s = serialize($bar);
>var_dump($s);
>
>
>in PHP_4_3 results to:
>
>object(foo)(1) {
>   ["bar_ref"]=>
>   object(bar)(1) {
>     ["foo_ref"]=>
>     NULL
>   }
>}
>object(bar)(1) {
>   ["foo_ref"]=>
>   object(foo)(1) {
>     ["bar_ref"]=>
>     object(bar)(1) {
>       ["foo_ref"]=>
>       NULL
>     }
>   }
>}
>string(58) "O:3:"foo":1:{s:7:"bar_ref";O:3:"bar":1:{s:7:"foo_ref";N;}}"
>string(86)
>"O:3:"bar":1:{s:7:"foo_ref";O:3:"foo":1:{s:7:"bar_ref";O:3:"bar":1:{s:7:"foo_ref";N;}}}"
>
>
>in HEAD:
>
>object(foo)#1 (1) {
>   ["bar_ref"]=>
>   object(bar)#2 (1) {
>     ["foo_ref"]=>
>     object(foo)#1 (1) {
>       ["bar_ref"]=>
>       object(bar)#2 (1) {
>         ["foo_ref"]=>
>         *RECURSION*
>       }
>     }
>   }
>}
>object(bar)#2 (1) {
>   ["foo_ref"]=>
>   object(foo)#1 (1) {
>     ["bar_ref"]=>
>     object(bar)#2 (1) {
>       ["foo_ref"]=>
>       object(foo)#1 (1) {
>         ["bar_ref"]=>
>         *RECURSION*
>       }
>     }
>   }
>}
>
>and a segfault (apache 1 sapi) or a runaway process (cli sapi).
>
>Jan.
>
>--
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