SplDoublyLinkedList::offsetExists
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplDoublyLinkedList::offsetExists — Returns whether the requested $index exists
说明
public SplDoublyLinkedList::offsetExists(
int $index):
bool
参数
index-
The index being checked.
返回值
true if the requested index exists, otherwise false