From: luka8088 at gmail dot com
Operating system:
PHP version: 5.3.0alpha2
PHP Bug Type: Feature/Change Request
Bug description: circular reference suggestion
Description:
------------
I have a suggestion for circular reference problem, already mentioned in
report 33595 ... I realize that it is already fix in cvs with David Wang's
patch, but maybe this would also be good to have ?
Reproduce code:
---------------
for example:
class foo {
function __construct () {
$this->bar = new bar($this);
}
function __refcount ($count) {
if ($count <= 1)
unset($this->bar);
}
}
class bar {
function __construct ($foo = null) {
$this->foo = $foo;
}
}
$object = new foo();
unset($object);
// $object->__refcount(1); // one reference left
Expected result:
----------------
now, this would create a circular reference when creating foo, and I
suggest that when a reference to an object is removed or added, and
refcount changes, a __refcount method is called, that way, in some cases
when object knows how many circular references it has, can unset them and
free the memory... in this example, foo knows that it has exactly 1
reference from bar, and if count is greater then 1, it is still needed...
I know that with this, David Wang's patch may still be needed for objects
that don't know the exact refcount, but this may have some good effect on
performance ? rather then calculating circular references ?
--
Edit bug report at http://bugs.php.net/?id=46654&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=46654&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=46654&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=46654&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=46654&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=46654&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=46654&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=46654&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=46654&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=46654&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=46654&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=46654&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=46654&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=46654&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=46654&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46654&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=46654&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=46654&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=46654&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=46654&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=46654&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=46654&r=mysqlcfg
