thinkphp截取字符串函数

msubstr() //截取字符串函数

例子：{$str|msubstr=0,10,'utf-8',false}

将下面的代码添加到ThinkPHP--Common--functions.php中：

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=false){

 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;

}