SPL
PHP Manual

The SplDoublyLinkedList class

Introduction

The SplDoublyLinkedList class provides the main functionalities of a doubly linked list.

Class synopsis

SplDoublyLinkedList
SplDoublyLinkedList implements Iterator , ArrayAccess , Countable {
/* Methods */
mixed SplDoublyLinkedList::key ( void )
void SplDoublyLinkedList::offsetSet ( mixed $index , mixed $newval )
mixed SplDoublyLinkedList::pop ( void )
mixed SplDoublyLinkedList::top ( void )
}

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SPL
PHP Manual