update : 2015.11.03
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Returns whether the requested $index exists
SplDoublyLinkedList
PHP Manual

SplDoublyLinkedList::offsetExists

(PHP 5 >= 5.3.0)

SplDoublyLinkedList::offsetExists — Returns whether the requested $index exists

설명

public bool SplDoublyLinkedList::offsetExists ( mixed $index )

인수

index

The index being checked.

반환값

TRUE if the requested index exists, otherwise FALSE

SplDoublyLinkedList
PHP Manual