Removing properties before the current element from an iterated object.
string(10) "Original a"
string(10) "Original b"
string(10) "Original d"
string(10) "Original e"
object(C)#1 (4) {
  ["a"]=>
  string(10) "Original a"
  ["b"]=>
  string(10) "Original b"
  ["d"]=>
  string(10) "Original d"
  ["e"]=>
  string(10) "Original e"
}

Removing properties before the current element from an iterated object.
string(10) "Original a"
string(10) "Original b"
string(10) "Original c"
string(10) "Original d"
string(10) "Original e"
object(C)#2 (4) {
  ["b"]=>
  string(10) "Original b"
  ["c"]=>
  string(10) "Original c"
  ["d"]=>
  string(10) "Original d"
  ["e"]=>
  string(10) "Original e"
}