IteratorIterator::valid()
(PHP 5>=5.1.0,PHP 7)
Checks if the iterator is valid
说明
public IteratorIterator::valid(void) : bool
Checks if the iterator is valid.
参数
此函数没有参数。
返回值
ReturnsTRUE
if 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()