EmptyIterator::valid
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
EmptyIterator::valid — Checks whether the current element is valid
说明
Checks whether the current element is valid.
注意:
The EmptyIterator is always empty and will never have a valid value. The return value is always
false.
参数
此函数没有参数。
返回值
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