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    SplObjectStorage::offsetExists

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

    SplObjectStorage::offsetExists — Checks whether an object exists in the storage

    说明

    public SplObjectStorage::offsetExists(object $object): bool

    Checks whether an object exists in the storage.

    注意:

    SplObjectStorage::offsetExists() is an alias of SplObjectStorage::contains().

    参数

    object

    The object to look for.

    返回值

    Returns true if the object exists in the storage, and false otherwise.

    示例

    示例 #1 SplObjectStorage::offsetExists() example

    <?php
    $s     = new SplObjectStorage;
    $o1 = new stdClass;
    $o2 = new stdClass;

    $s->attach($o1);

    var_dump($s->offsetExists($o1)); // Similar to isset($s[$o1])
    var_dump($s->offsetExists($o2)); // Similar to isset($s[$o2])
    ?>

    以上示例的输出类似于：

    bool(true)
bool(false)

    参见

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