1 /**
2 +----------------------------------------------------------
3 * 字符串截取，支持中文和其他编码
4 +----------------------------------------------------------
5 * @static
6 * @access public
7 +----------------------------------------------------------
8 * @param string $str 需要转换的字符串
9 * @param string $start 开始位置
10 * @param string $length 截取长度
11 * @param string $charset 编码格式
12 * @param string $suffix 截断显示字符
13 +----------------------------------------------------------
14 * @return string
15 +----------------------------------------------------------
16 */
17 function msubstr2($str, $start=0, $length, $suffix=true, $charset="utf-8")
18 {
19 if(function_exists("mb_substr")){
20 if ($suffix && strlen($str)>$length)
21 return mb_substr($str, $start, $length, $charset)."...";
22 else
23 return mb_substr($str, $start, $length, $charset);
24 }
25 elseif(function_exists('iconv_substr')) {
26 if ($suffix && strlen($str)>$length)
27 return iconv_substr($str,$start,$length,$charset)."...";
28 else
29 return iconv_substr($str,$start,$length,$charset);
30 }
31 $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
32 $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
33 $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
34 $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
35 preg_match_all($re[$charset], $str, $match);
36 $slice = join("",array_slice($match[0], $start, $length));
37 if($suffix) return $slice."…";
38 return $slice;
39 }
