SplDoublyLinkedList::setIteratorMode

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:

<?php
$l = new SPLDoublyLinkedList();
$l->setIteratorMode(SplDoublyLinkedList::IT_MODE_DELETE);
$l->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO);

$mode = $l->getIteratorMode();
var_dump("MODE: $mode");
var_dump("MODE CHECKS");
var_dump(($mode & SplDoublyLinkedList::IT_MODE_LIFO) == SplDoublyLinkedList::IT_MODE_LIFO);
var_dump(($mode & SplDoublyLinkedList::IT_MODE_FIFO) == SplDoublyLinkedList::IT_MODE_FIFO);
var_dump(($mode & SplDoublyLinkedList::IT_MODE_DELETE) == SplDoublyLinkedList::IT_MODE_DELETE);
var_dump(($mode & SplDoublyLinkedList::IT_MODE_KEEP) == SplDoublyLinkedList::IT_MODE_KEEP);

$l->push('A');
$l->push('B');
$l->push('C');
$l->push('D');
$l->rewind();

var_dump("Traversing");
var_dump($l->isEmpty());

var_dump($l->count());
var_dump($l->current());
$l->next();

var_dump($l->count());
var_dump($l->current());
$l->next();

var_dump($l->count());
var_dump($l->current());
$l->next();

var_dump($l->count());
var_dump($l->current());
$l->next();

var_dump($l->count());
var_dump($l->isEmpty());

?>

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:

<?php
$l = new SPLDoublyLinkedList();
$l->setIteratorMode(SplDoublyLinkedList::IT_MODE_FIFO | SplDoublyLinkedList::IT_MODE_DELETE);

$mode = $l->getIteratorMode();

$isLIFO = ($mode & SplDoublyLinkedList::IT_MODE_LIFO) == SplDoublyLinkedList::IT_MODE_LIFO;

$isDELETE = ($mode & SplDoublyLinkedList::IT_MODE_DELETE) == SplDoublyLinkedList::IT_MODE_DELETE;
?>

hope this helps someone.

Usage of different Iterator Mode<?php$doubly=new SplDoublyLinkedList();$doubly->push(array('name'=>'Naruto'));$doubly->push(array('name'=>'Sakura'));$doubly->push(array('name'=>'Neji'));$doubly->push(array('name'=>'Sasuke'));var_dump($doubly);echo '<br/> FIFO Traversing<br/>';$doubly->setIteratorMode(SplDoublyLinkedList::IT_MODE_FIFO | SplDoublyLinkedList::IT_MODE_KEEP);$doubly->rewind();foreach($doubly as $key=>$value){    echo '<br/>Traversed:'.$key.' '.$value['name'];}echo '<br/>LIFO Traversing - Keep mode <br/>';$doubly->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_KEEP);$doubly->rewind();foreach($doubly as $key=>$value){    echo '<br/>Traversed:'.$key.' '.$value['name'];}echo '<br/>LIFO Traversing - Delete mode <br/>';$doubly->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_DELETE);$doubly->rewind();foreach($doubly as $key=>$value){    if($key == 2) break;    echo '<br/>Traversed:'.$key.' '.$value['name'];}var_dump($doubly);?>Output:FIFO TraversingTraversed:0 NarutoTraversed:1 SakuraTraversed:2 NejiTraversed:3 SasukeLIFO Traversing - Keep mode Traversed:3 SasukeTraversed:2 NejiTraversed:1 SakuraTraversed:0 NarutoLIFO Traversing - Delete mode Traversed:3 Sasukeobject(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"    }  }}