Truncate a multibyte String to n chars

Just found out PHP already has a multibyte truncate with

• mb_strimwidth — Get truncated string with specified width

It doesn't obey word boundaries though. But handy nonetheless!

Try this:

function truncate($string, $chars = 50, $terminator = ' …') {
    $cutPos = $chars - mb_strlen($terminator);
    $boundaryPos = mb_strrpos(mb_substr($string, 0, mb_strpos($string, ' ', $cutPos)), ' ');
    return mb_substr($string, 0, $boundaryPos === false ? $cutPos : $boundaryPos) . $terminator;
}

But you need to make sure that your internal encoding is properly set.