detach() freaks the internal pointer out, so cannot be used within foreach

[john-n-smith]

It seems to try to set the internal pointer to 1

$spl = new SplObjectStorage();

$n = 4;

for($i=0; $i < $n; $i++) {
  $object = new StdClass;
  $spl->attach($object);
}
foreach($spl as $object) {
    echo $spl->key() . '<br>';
    $spl->detach($object);
}

results in

0
1
1

n = 3:

0
1

n = 2:

0

[adlawson]

Good bug finding!