Iterator::key

    (PHP 5, PHP 7, PHP 8)

    Iterator::key — Return the key of the current element

    Description

    publicIterator::key(): mixed

    Returns the key of the current element.

    Parameters

    This function has no parameters.

    Return Values

    Returns scalar on success, or null on failure.

    Errors/Exceptions

    Issues E_NOTICE on failure.

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