IteratorIterator::key

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

IteratorIterator::key — Get the key of the current element

说明

Get the key of the current element.

参数

此函数没有参数。

返回值

The key of the current element.

参见

• IteratorIterator::current() - Get the current value