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

    interfaceOuterIteratorextendsIterator {
    publicgetInnerIterator(): ?Iterator
    publicIterator::current(): mixed
    publicIterator::key(): mixed
    publicIterator::next(): void
    publicIterator::rewind(): void
    publicIterator::valid(): bool
    }

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