ArrayObject::offsetExists

    (PHP 5, PHP 7, PHP 8)

    ArrayObject::offsetExists — Returns whether the requested index exists

    说明

    public ArrayObject::offsetExists(mixed $key): bool

    参数

    key

    The index being checked.

    返回值

    true if the requested index exists, otherwise false

    示例

    示例 #1 ArrayObject::offsetExists() example

    <?php
    $arrayobj     = new ArrayObject(array('zero', 'one', 'example'=>'e.g.'));
    var_dump($arrayobj->offsetExists(1));
    var_dump($arrayobj->offsetExists('example'));
    var_dump($arrayobj->offsetExists('notfound'));
    ?>

    以上示例会输出：

    bool(true)
bool(true)
bool(false)

    Improve This Page

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes

    There are no user contributed notes for this page.
    To Top