IteratorIterator::valid

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

IteratorIterator::valid — Checks if the iterator is valid

说明

public IteratorIterator::valid ( ) : bool

Checks if the iterator is valid.

参数

此函数没有参数。

返回值

Returns true if the iterator 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

User Contributed Notes

mike at eastghost dot com 18-Jan-2018 03:24


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()