« FilterIterator::getInnerIterator FilterIterator::next » PHP Manual FilterIterator Get the current key FilterIterator::key (PHP 5 >= 5.1.0, PHP 7) FilterIterator::key — Get the current key 说明 public FilterIterator::key ( void ) : mixed Warning 本函数还未编写文档,仅有参数列表。 Get the current key. 参数 此函数没有参数。 返回值 The current key. 参见 FilterIterator::next() - Move the iterator forward FilterIterator::current() - Get the current element value