SplDoublyLinkedList::isEmpty
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplDoublyLinkedList::isEmpty — Checks whether the doubly linked list is empty
说明
public SplDoublyLinkedList::isEmpty
(
) : bool
参数
此函数没有参数。
返回值
Returns whether the doubly linked list is empty.