ThinkPHP 小技巧

中文截取函数

函数解释：
msubstr($str, $start=0, $length, $charset=”utf-8″, $suffix=true)
$str:要截取的字符串
$start=0：开始位置，默认从0开始
$length：截取长度
$charset=”utf-8″：字符编码，默认UTF－8
$suffix=true：是否在截取后的字符后面显示省略号，默认true显示，false为不显示
模版使用：{$vo.title|msubstr=0,5,'utf-8',false}

 如果没有的话 直接把函数放进公共函数库，函数如下：

/**
 * 函数：中文截取
 * @          
 * @          
 */
function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)  
    {  
  if(function_exists("mb_substr")){  
              if($suffix)  
              return mb_substr($str, $start, $length, $charset)."...";  
              else
                   return mb_substr($str, $start, $length, $charset);  
         }  
         elseif(function_exists('iconv_substr')) {  
             if($suffix)  
                  return iconv_substr($str,$start,$length,$charset)."...";  
             else
                  return iconv_substr($str,$start,$length,$charset);  
         }  
         $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, $length));  
         if($suffix) return $slice."…";  
         return $slice;
    }