//Cycle example:
class myClass
{
	public $member;
}
function LimitedScope()
{
	$myA = new myClass();
	$myB = new SplObjectStorage();
	$myC = new myClass();
	$myC->member = $myA; // myC has a referece to myA
	$myB->Attach($myC);  // myB attaches myC
	$myA->member = $myB; // myA has myB, comleting the cycle
}
echo "Memory used:   ".$mem = memory_get_usage()."\n";
echo "Function Call\n";
LimitedScope();
echo "Memory used:   ".memory_get_usage()."\n";
echo "Cycles culled: ".gc_collect_cycles()."       should be 1\n";
echo "Memory used:   ".memory_get_usage()."  should be {$mem}";

This bug has been fixed in SVN.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

Fixed for PHP 5.3 and trunk.