ArrayObject::offsetExists

    (PHP 5, PHP 7, PHP 8)

    ArrayObject::offsetExists — Returns whether the requested index exists

    说明

    publicArrayObject::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)
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