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
    }

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