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  • IteratorIterator::valid()

    (PHP 5>=5.1.0,PHP 7)

    Checks if the iterator is valid

    说明

    publicIteratorIterator::valid(void) : bool

    Checks if the iterator is valid.

    参数

    此函数没有参数。

    返回值

    ReturnsTRUEif the iterator is valid,otherwiseFALSE

    参见

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