# The OuterIterator interface

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

## Introduction

Classes implementing OuterIterator can be used to iterate over iterators.

## Interface synopsis

interface OuterIterator extends Iterator {
/* Methods */
public getInnerIterator(): ?Iterator
/* Inherited methods */
public Iterator::current(): mixed
public Iterator::key(): mixed
public Iterator::next(): void
public Iterator::rewind(): void
public Iterator::valid(): bool
}

## Table of Contents

- OuterIterator::getInnerIterator — Returns the inner iterator for the current entry

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