Introdução
    PHP Manual
    PHP Manual»Interfaces»OuterIterator

    A interface OuterIterator

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

    Classes que implementam OuterIterator podem ser usadas para iterar sobre iteradores.

    interface OuterIterator extends Iterator {
    /* Métodos */
    public function getInnerIterator(): ?Iterator
    /* Métodos herdados */
    public function Iterator::current(): mixed
    public function Iterator::key(): mixed
    public function Iterator::next(): void
    public function Iterator::rewind(): void
    public function Iterator::valid(): bool
    }

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