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

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mike at eastghost dot com ¶

7 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()