IteratorIterator::valid

(PHP 5 >= 5.1.0, PHP 7)

IteratorIterator::valid — 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

Returns TRUE if the iterator is valid, otherwise FALSE

参见

User Contributed Notes

mike at eastghost dot com 18-Jan-2018 03:24
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()