MultipleIterator::key

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

MultipleIterator::key — Gets the registered iterator instances

说明

public MultipleIterator::key(): array

Get the registered iterator instances key() result.

警告

本函数还未编写文档，仅有参数列表。

参数

此函数没有参数。

返回值

An array of all registered iterator instances.

错误／异常

A RuntimeException if the iterator is invalid (as of PHP 8.1.0), or mode MIT_NEED_ALL is set, and at least one attached iterator is not valid.

Calling this method from foreach triggers warning "Illegal type returned".

更新日志

版本 说明
8.1.0 A RuntimeException is now thrown if MultipleIterator::key() is called on an invalid iterator. Previously, false was returned.

参见