php截取字符串,带中文,多余的省略号代替

function subtext($text, $length)
{
    if(mb_strlen($text, 'utf8') > $length) {
        return mb_substr($text, 0, $length, 'utf8').'...';
    } else {
        return $text;
    }
}
$str = '我们是family happy family';
echo subtext($str,5); //我们是fa...
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