SplDoublyLinkedList
PHP Manual

SplDoublyLinkedList::offsetExists

(PHP 5 >= 5.3.0, PHP 7)

SplDoublyLinkedList::offsetExistsReturns whether the requested $index exists

Description

public bool SplDoublyLinkedList::offsetExists ( mixed $index )

Parameters

index

The index being checked.

Return Values

TRUE if the requested index exists, otherwise FALSE


SplDoublyLinkedList
PHP Manual