(PHP 5 >= 5.4.0, PHP 7, PHP 8)
CallbackFilterIterator::accept — Calls the callback with the current value, the current key and the inner iterator as arguments
This method calls the callback with the current value, current key and the inner iterator.
The callback is expected to return true if the current item is
to be accepted, or false otherwise.
此函数没有参数。
Returns true to accept the current item, or false otherwise.