The offsetExists purpose
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    CachingIterator::offsetExists

    CachingIterator::offsetExists — The offsetExists purpose

    Description

    public CachingIterator::offsetExists(string $key): bool
    Warning

    This function is currently not documented; only its argument list is available.

    Parameters

    key

    The index being checked.

    Return Values

    Returns true if an entry referenced by the offset exists, false otherwise.