|\r|\n|\s|\[.+?\])/is", ' ', $str); if (function_exists("mb_substr"))     $slice = mb_substr($str, $start, $length, $charset); elseif (function_exists('iconv_substr')) {     $slice = iconv_substr($str, $start, $length, $charset);     if (false === $slice) {         $slice = '';     } } else {     $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)); } $fix = ''; if (LANG_SET == 'zh') {     $slice = str_replace(' ', '', $slice);     if (strlen($slice) > $length) {         $fix = '...';     } } else {     if (strlen($str) > $lenth2) {         $fix = '...';     } } return $suffix ? $slice . $fix : $slice; }$str = "dsd个法师dsad打发dd的撒ddsddsadsadsads的撒";echo msubstr($str,1,2,20,true);?>