參數

mode

There is only one iteration parameter you can modify.

• The behavior of the iterator (either one or the other):
  • SplDoublyLinkedList::IT_MODE_DELETE (Elements are deleted by the iterator)
  • SplDoublyLinkedList::IT_MODE_KEEP (Elements are traversed by the iterator)

The default mode is 0x2 : SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_KEEP

警告

The direction of iteration can no longer be changed for SplStacks. Trying to do so will result in a RuntimeException being thrown.