SplDoublyLinkedList
PHP Manual

SplDoublyLinkedList::offsetExists

(PHP 5 >= 5.3.0)

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

说明

bool SplDoublyLinkedList::offsetExists ( mixed $index )

参数

index

The index being checked.

返回值

TRUE if the requested index exists, otherwise FALSE

SplDoublyLinkedList
PHP Manual