IteratorIterator::valid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

IteratorIterator::valid — Checks if the current element is valid

说明

public IteratorIterator::valid(): bool

Checks whether the current element is valid.

参数

此函数没有参数。

返回值

Returns true if the current element is valid, otherwise false

参见

iterator_count() - 计算迭代器中元素的个数
IteratorIterator::current() - Get the current value

改进此页面

了解如何改进此页面 • 提交拉取请求 • 报告一个错误

＋添加备注

用户贡献的备注 1 note

down

mike at eastghost dot com ¶

6 years ago

An Iterator is "valid" when it has additional elements, beyond its element index.

Said another way: After an Iterator is next()'d to its final element, the Iterator is no longer "valid".

Said another way: A "hasNext" check would simply return ::valid()