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    IteratorIterator::getInnerIterator

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

    IteratorIterator::getInnerIterator — 内部イテレータを取得する

    説明

    public IteratorIterator::getInnerIterator(): ?Iterator

    内部イテレータを取得します。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    IteratorIterator::__construct() に渡した内部イテレータを返します。 内部イテレータが存在しない場合は、null を返します。

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    User Contributed Notes 1 note

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    c dot 1 at smithies dot org
    8 years ago
    The returned value from getInnerIterator() really is the inner iterator, not a clone. It should be used with respect: calling next() or rewind() on it, for example, will advance or reset the inner iterator - although the effect won't be noticed until you call next() on the IteratorIterator object - it seems as if it caches its current() and key() values (as of PHP v5.5.9). Even if the inner iterator itself is valid (i.e. valid() returns TRUE) the IteratorIterator won't report itself as valid until you either rewind it or call its next() method - these two methods cause the IteratorIterator to re-sync its current, key and valid states with the inner iterator.

    <?php
    $ii     = new IteratorIterator(new ArrayIterator(range(1,6)));
    $i1 = $ii->getInnerIterator(); // gets the real thing
    $i2 = $ii->getInnerIterator(); // ditto: $i2 === $i1 and the two are therefore in sync.
    echo $i1->current(); // 1
    echo $i1->key(); // 0
    var_dump($ii->valid()); // FALSE
    $i1->next(); // affects $i2, which is identical
    echo $i1->key(); // 1
    var_dump($ii->valid()); // still FALSE
    $ii->rewind(); // rewinds $i1 and synchronizes
    echo $ii->key(); // 0, as is $i1->key()
    $i1->next(); // advances the inner iterator, which is now out of sync
    echo $ii->key(); // still 0
    echo $i1->key(); // 1
    $ii->next(); // advances the inner iterator and syncs with it
    echo $ii->key(); // 2
    echo $i1->key(); // 2
    ?>
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