截取字符串函数

Laravel：

function limit($value, $limit = 100, $end = '...')
{
    if (mb_strwidth($value, 'UTF-8') <= $limit) {
        return $value;
    }

    return rtrim(mb_strimwidth($value, 0, $limit, '', 'UTF-8')).$end;
}

Ci：

function word_limiter($str, $limit = 100, $end_char = '…')
{
    if (trim($str) === '')
    {
        return $str;
    }

    preg_match('/^\s*+(?:\S++\s*+){1,'.(int) $limit.'}/', $str, $matches);

    if (strlen($str) === strlen($matches[0]))
    {
        $end_char = '';
    }

    return rtrim($matches[0]).$end_char;
}

......