SplDoublyLinkedList
PHP 手册

SplDoublyLinkedList::offsetExists

(PHP 5 >= 5.3.0)

SplDoublyLinkedList::offsetExistsReturns whether the requested $index exists

说明

public 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 手册