public static function cutstr($string, $length, $suffix = true, $charset = "utf-8", $start = 0, $dot = ' ...')
    {
        $str = str_replace(['&amp;', '&quot;', '&lt;', '&gt;'], ['&', '"', '<', '>'], $string);
        if (function_exists("mb_substr")) {
            $strcut = mb_substr($str, $start, $length, $charset);
            if (mb_strlen($str, $charset) > $length) {
                return $suffix ? $strcut . $dot : $strcut;
            }
            return $strcut;
        }
        $re = [];
        $match = [''];
        $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
        $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
        $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
        preg_match_all($re[$charset], $str, $match);
        $slice = join("", array_slice($match[0], $start, $length));
        $strcut = str_replace(['&', '"', '<', '>'], ['&amp;', '&quot;', '&lt;', '&gt;'], $slice);
        return $suffix ? $strcut . $dot : $strcut;
    }
public static function cutstr($string, $length, $suffix = true, $charset = "utf-8", $start = 0, $dot = ' ...')
    {
        $str = str_replace(['&amp;', '&quot;', '&lt;', '&gt;'], ['&', '"', '<', '>'], $string);
        if (function_exists("mb_substr")) {
            $strcut = mb_substr($str, $start, $length, $charset);
            if (mb_strlen($str, $charset) > $length) {
                return $suffix ? $strcut . $dot : $strcut;
            }
            return $strcut;
        }
        $re = [];
        $match = [''];
        $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
        $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
        $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
        preg_match_all($re[$charset], $str, $match);
        $slice = join("", array_slice($match[0], $start, $length));
        $strcut = str_replace(['&', '"', '<', '>'], ['&amp;', '&quot;', '&lt;', '&gt;'], $slice);
        return $suffix ? $strcut . $dot : $strcut;
    }
public static function cutstr ( $ string , $ length , $ suffix = true , $ charset = "utf-8" , $ start = 0 , $ dot = ' ...' ) { $ str = str_replace ( [ '&amp;' , '&quot;' , '&lt;' , '&gt;' ] , [ '&' , '"' , '<' , '>' ] , $ string ) ; if ( function_exists ( "mb_substr" ) ) { $ strcut = mb_substr ( $ str , $ start , $ length , $ charset ) ; if ( mb_strlen ( $ str , $ charset ) > $ length ) { return $ suffix ? $ strcut . $ dot : $ strcut ; } return $ strcut ; } $ re = [ ] ; $ match = [ '' ] ; $ re [ 'utf-8' ] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/" ; $ re [ 'gb2312' ] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/" ; $ re [ 'gbk' ] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/" ; $ re [ 'big5' ] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/" ; preg_match_all ( $ re [ $ charset ] , $ str , $ match ) ; $ slice = join ( "" , array_slice ( $ match [ 0 ] , $ start , $ length ) ) ; $ strcut = str_replace ( [ '&' , '"' , '<' , '>' ] , [ '&amp;' , '&quot;' , '&lt;' , '&gt;' ] , $ slice ) ; return $ suffix ? $ strcut . $ dot : $ strcut ; }
cut string to set length
return string
@param $string
@param $length
@param bool $suffix
@param string $charset
@param int $start
@param string $dot
@return mixed|string
cut string to set length return string