This function will return TRUE whenever the iterator is within the array bounds, even if unset() has been called on the current element.
(PHP 5 >= 5.3.0, PHP 7)
SplFixedArray::valid — 配列にまだ要素があるかどうかを調べる
この関数にはパラメータはありません。
This function will return TRUE whenever the iterator is within the array bounds, even if unset() has been called on the current element.