IteratorIterator::valid

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

    IteratorIterator::valid — 現在の要素が有効かどうかを調べる

    説明

    public IteratorIterator::valid(): bool

    現在の要素が有効かどうかを調べます。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    現在の要素が有効な場合に true、それ以外の場合に false を返します。

    参考

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    User Contributed Notes 1 note

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    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()
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