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    SplObjectStorage::offsetSet

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    SplObjectStorage::offsetSet — ストレージ内のオブジェクトにデータを関連づける

    説明

    public SplObjectStorage::offsetSet(object $object, mixed $info = null): void

    ストレージ内のオブジェクトにデータを関連づけます。

    注意:

    SplObjectStorage::offsetSet() は、 SplObjectStorage::attach() のエイリアスです。

    パラメータ

    object

    データを関連づけたいオブジェクト。

    info

    object に関連づけるデータ。

    戻り値

    値を返しません。

    例

    例1 SplObjectStorage::offsetSet() の例

    <?php
    $s     = new SplObjectStorage;

    $o1 = new stdClass;

    $s->offsetSet($o1, "hello"); // $s[$o1] = "hello"; と同等

    var_dump($s[$o1]);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    string(5) "hello"

    参考

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    User Contributed Notes 1 note

    up
    1
    aderh
    1 year ago
    Although `offsetSet` is supposed to be an alias to `attach`, real-world results do not indicate that. When extending the SplObjectStorage class, it's expected that a modification to `attach` would also affect `offsetSet`. However, it seems they need to both be extended. Consider the results below...

    <?php

    declare(strict_types=1);

    class     CustomSplObjectStorage extends SplObjectStorage
    {
    public function     offsetSet(mixed $object, mixed $info = null): void
    {
    print(    "offsetSet called\n");
    parent::offsetSet($object, $info);
    }

    public function     attach(mixed $object, mixed $info = null): void
    {
    print(    "attach called\n");
    parent::attach($object, $info);
    }
    }

    $a = new CustomSplObjectStorage();
    $a[new stdClass()] = 'ok';
    $a->attach(new stdClass(), 'ok');
    ?>

    This prints:
    ```
    offsetSet called
    attach called
    ```

    While we would expect...

    ```
    offsetSet called
    attach called
    attach called
    ```

    ... if `offsetSet` was a true alias of `attach`. I'm not sure if this is intentional or not.
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