PHP Manual
EmptyIterator
The key() method

EmptyIterator::key

(PHP 5 >= 5.1.0, PHP 7)

EmptyIterator::key — The key() method

说明

public EmptyIterator::key ( void ) : scalar

This function must not be called. It throws an exception upon access.

Warning

本函数还未编写文档，仅有参数列表。

参数

此函数没有参数。

错误／异常

Throws an Exception if called.

返回值

没有返回值。

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