SplDoublyLinkedList::setIteratorMode() - 数据结构
SplDoublyLinkedList::setIteratorMode()
(PHP 5 >= 5.3.0, PHP 7)
Sets the mode of iteration
说明
publicSplDoublyLinkedList::setIteratorMode(int $mode) : void参数
$modeThere are two orthogonal sets of modes that can be set:
- The direction of the iteration (either one or the other):
SplDoublyLinkedList::IT_MODE_LIFO
(Stack style)SplDoublyLinkedList::IT_MODE_FIFO
(Queue style)
- 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:SplDoublyLinkedList::IT_MODE_FIFO
| SplDoublyLinkedList::IT_MODE_KEEP
返回值
没有返回值。
Despite the seeming unrelated-ness between the FIFO/LIFO and the KEEP/DELETE option pairs, in respect to the behavior of setIteratorMode they are in some way linked. Meaning, a second call to setIteratorMode will erase any previous settings even if they are from the other pair. This, coupled with the default settings for the object (SplDoublyLinkedList::IT_MODE_FIFO | SplDoublyLinkedList::IT_MODE_KEEP), means you have to be careful or you can run into trouble Consider the following example: Which outputs the following: ############################# string(7) "MODE: 2" string(11) "MODE CHECKS" bool(true) #LIFO (ok) bool(true) #FIFO (umm...wait a minute) bool(false)#DELETE (houston... wtf) bool(true) #KEEP (ok, where's the camera hidden) string(10) "Traversing" bool(false) int(4) string(1) "D" int(4) string(1) "C" int(4) string(1) "B" int(4) string(1) "A" int(4) bool(false) ############################# Basically, you should just check the non-zero flags (LIFO(2) and DELETE(1)). Since it's an either/or situation within the pairs, this should be able to help you figure out the separate mode pieces an instance has been set to. example: hope this helps someone.
Usage of different Iterator Mode Output: FIFO Traversing Traversed:0 Naruto Traversed:1 Sakura Traversed:2 Neji Traversed:3 Sasuke LIFO Traversing - Keep mode Traversed:3 Sasuke Traversed:2 Neji Traversed:1 Sakura Traversed:0 Naruto LIFO Traversing - Delete mode Traversed:3 Sasuke object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(3) ["dllist":"SplDoublyLinkedList":private]=> array(3) { [0]=> array(1) { ["name"]=> string(6) "Naruto" } [1]=> array(1) { ["name"]=> string(6) "Sakura" } [2]=> array(1) { ["name"]=> string(4) "Neji" } } }
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