PHP Manual
SplDoublyLinkedList
Returns whether the requested $index exists

SplDoublyLinkedList::offsetExists

(PHP 5 >= 5.3.0, PHP 7)

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

说明

public SplDoublyLinkedList::offsetExists ( mixed $index ) : bool

参数

index: The index being checked.

返回值

TRUE if the requested index exists, otherwise FALSE

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