Bug #55228 [Com]: Objects cannot be collected if they extends some spl classes

[cofyc dot jackson at gmail dot com]

Edit report at https://bugs.php.net/bug.php?id=55228&edit=1

 ID:                 55228
 Comment by:         cofyc dot jackson at gmail dot com
 Reported by:        cofyc dot jackson at gmail dot com
 Summary:            Objects cannot be collected if they extends some spl
                     classes
 Status:             Duplicate
 Type:               Bug
 Package:            SPL related
 Operating System:   Mac OS X
 PHP Version:        5.3.6
 Block user comment: N
 Private report:     N

 New Comment:

Can you fix ArrayObject/ArrayIterator classes like SPLObjectStorage in 
bug #53071?

We use these two classes in production.

This gc bug troubles us very much.

Thanks in advance.


Previous Comments:
------------------------------------------------------------------------
[2011-07-22 04:43:19] cataphr...@php.net

Duplicate of bug #53803.

------------------------------------------------------------------------
[2011-07-18 07:31:08] cofyc dot jackson at gmail dot com

Description:
------------
If objects' classes extends ArrayIterator/ArrayObject, and recursively refer to 
each other, they will not be garbage collected.

I tried reproduction code in https://bugs.php.net/bug.php?id=33595, modified A 
to 
extend ArrayIterator, B to extend ArrayObject.

And is there a way to work around it currently?

Test script:
---------------
<?php
class A extends ArrayIterator {
    function __construct () {
        $this->b = new B($this);
    }
}

class B extends ArrayObject {
    function __construct ($parent = NULL) {
        $this->parent = $parent;
    }
}

for ($i = 0 ; $i < 1000000 ; $i++) {
    $a = new A();
    printf("gc: %d, %f\n", gc_collect_cycles(), memory_get_usage()/1024/1024);
}




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Edit this bug report at https://bugs.php.net/bug.php?id=55228&edit=1