On Tue, 29 Jul 2003 13:52:39 +0200
Magnus Maatta <magnus@php.net> wrote:
> <?php
> class a {
> var $items = array();
> function a() {
> }
>
> }
> class b {
> var $a;
> function b(&$a) {
> $this->a = &$a;
> }
> }
> $a = new a();
> for ($i = 0; $i <= 4; $i++) {
> $a->items[] = new b($a);
> }
> print_r($a);
> ?>
>
>
> With PHP5:
> [4] => b Object
> (
> [a] => a Object
> *RECURSION*
> )
>
> )
>
> )
> /opt/dev/php/php5/Zend/zend_hash.c(374) : Freeing 0x4153718C (35 bytes), script=24811.php
> Last leak repeated 4 times
> /opt/dev/php/php5/Zend/zend_hash.c(233) : Freeing 0x41537130 (37 bytes), script=24811.php
> Last leak repeated 5 times
> /opt/dev/php/php5/Zend/zend_API.c(677) : Freeing 0x415370DC (32 bytes), script=24811.php
> /opt/dev/php/php5/Zend/zend_hash.c(154) : Actual location (location was relayed)
> Last leak repeated 5 times
> /opt/dev/php/php5/Zend/zend_execute.c(3037) : Freeing 0x41537078 (44 bytes), script=24811.php
> /opt/dev/php/php5/Zend/zend_API.c(676) : Actual location (location was relayed)
> Last leak repeated 5 times
> /opt/dev/php/php5/Zend/zend_objects.c(95) : Freeing 0x41537034 (12 bytes), script=24811.php
> Last leak repeated 5 times
> /opt/dev/php/php5/Zend/zend_execute.c(3036) : Freeing 0x41536FF0 (16 bytes), script=24811.php
> Last leak repeated 5 times
> /opt/dev/php/php5/Zend/zend_variables.c(123) : Freeing 0x41538EE8 (32 bytes), script=24811.php
> /opt/dev/php/php5/Zend/zend_hash.c(154) : Actual location (location was relayed)
> /opt/dev/php/php5/Zend/zend_execute.c(793) : Freeing 0x41538E84 (44 bytes), script=24811.php
> /opt/dev/php/php5/Zend/zend_variables.c(122) : Actual location (location was relayed)
> Last leak repeated 1 time
>
>
> PHP4:
> [4] => b Object
> (
> [a] => a Object
> (
> [items] => Array
> *RECURSION*
> )
>
> )
>
> )
>
> )
> /opt/dev/php/php4/Zend/zend_hash.c(406) : Freeing 0x081F009C (35 bytes), script=24811.php
> Last leak repeated 4 times
> /opt/dev/php/php4/Zend/zend_hash.c(178) : Freeing 0x081EFFF4 (32 bytes), script=24811.php
> Last leak repeated 6 times
> /opt/dev/php/php4/Zend/zend_API.c(594) : Freeing 0x081EFF94 (44 bytes), script=24811.php
> /opt/dev/php/php4/Zend/zend_API.c(582) : Actual location (location was relayed)
> Last leak repeated 5 times
> /opt/dev/php/php4/Zend/zend_execute.c(1975) : Freeing 0x081EFF54 (12 bytes), script=24811.php
> Last leak repeated 5 times
> /opt/dev/php/php4/Zend/zend_hash.c(262) : Freeing 0x081EFEA4 (37 bytes), script=24811.php
> Last leak repeated 5 times
> /opt/dev/php/php4/Zend/zend_execute.c(774) : Freeing 0x081F1454 (44 bytes), script=24811.php
> /opt/dev/php/php4/Zend/zend_variables.c(122) : Actual location (location was relayed)
> Last leak repeated 1 time
That's a known problem. As of the current engine implementation,
circular referencing is just inevitable and will end up with lots of leaks.
This couldn't be a big deal unless you are trying to make a long-living
application with a reference-count-based scripting language.
(But it can be prevented with some trick IMO)
http://msdn.microsoft.com/library/en-us/vbcon98/html/vbcondealingwithcircularreferences.asp
Hope this helps.
Moriyoshi
