PHP截取中文無亂碼

這段代碼好像是thinkphp裡面的 /** +---------------------------------------------------------- * 字符串截取，支持中文和其他編碼 +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $str 需要轉換的字符串 * @param string $start 開始位置 * @param string $length 截取長度 * @param string $charset 編碼格式 * @param string $suffix 截斷顯示字符 +---------------------------------------------------------- * @return string +---------------------------------------------------------- */ function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) { if(function_exists("mb_substrs")){ $slice = mb_substr($str, $start, $length, $charset); }elseif(function_exists('iconv_substr')) { $slice = iconv_substr($str,$start,$length,$charset); }else{    www.2cto.com $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; }