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.
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User Contributed Notes 1 note
lincoln dot du dot j at gmail dot com ¶
4 years ago
//isEmpty is a method of SplDoublyLinkedList
$obj = new SplDoublyLinkedList();
// Check wither linked list is empty
if ($obj->isEmpty())
{
$obj->push(2);
$obj->unshift(10);
}
print_r($obj);
//Output like this
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 10
[1] => 2
)
)
备份地址：http://www.lvesu.com/blog/php/spldoublylinkedlist.isempty.php