(PHP 5 >= 5.5.0, PHP 7)
IntlBreakIterator::isBoundary — Tell whether an offset is a boundaryʼs offset
public IntlBreakIterator::isBoundary ( int $offset ) : bool
This function is currently not documented; only its argument list is available.
offset
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https://www.php.net/manual/en/intlbreakiterator.isboundary.php