update : 2015.11.03
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Return current node index
SplDoublyLinkedList
PHP Manual

SplDoublyLinkedList::key

(PHP 5 >= 5.3.0)

SplDoublyLinkedList::key — Return current node index

설명

public mixed SplDoublyLinkedList::key ( void )

This function returns the current node index

인수

이 함수는 인수가 없습니다.

반환값

The current node index.

SplDoublyLinkedList
PHP Manual