Description:
------------
Foreach used to always copy string keys:
    key_type = zend_hash_get_current_key_ex(fe_ht, &str_key, &str_key_len, &int_key, 1, NULL);

Since fcc6611de9054327441786e52444b5f8eecdd525 it instead uses:
    zend_hash_get_current_key_zval(fe_ht, key);

This only copies string keys if IS_INTERNED(), however in some cases (at least in get_object_vars() like in the test script) the key name is an unmangled property name which is *within* an interned string. So IS_INTERNED is true but INTERNED_LEN and INTERNED_HASH are nonsense.

The later unset and assignment in the test script use the nonsense INTERNED_HASH.

The simple fix is to make get_object_vars() copy the property names (as in the attached patch) but it's quite possible that other code has been broken in the same way, so the safer fix might be to force the copy again.


Test script:
---------------
https://gist.github.com/arraypad/5280321

Expected result:
----------------
Unsetting: unsetme
Changing: keepme
array(1) {
  ["keepme"]=>
  int(43)
}
array(1) {
  [0]=>
  string(6) "keepme"
}

Actual result:
--------------
Unsetting: unsetme
Changing: keepme
array(3) {
  ["unsetme"]=>
  int(1)
  ["keepme"]=>
  int(43)
  ["keepme"]=>
  int(42)
}
array(3) {
  [0]=>
  string(7) "unsetme"
  [1]=>
  string(6) "keepme"
  [2]=>
  string(6) "keepme"
}