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 — Check whether the array contains more elements
Checks if the array contains any more elements.
此函数没有参数。
Returns true if the array contains any more elements, false otherwise.
This function will return TRUE whenever the iterator is within the array bounds, even if unset() has been called on the current element.