= $length){            $next_str = "…";        }else{            $next_str = "";        }        if(function_exists("mb_substr")){            if($suffix)                // return mb_substr($str, $start, $length, $charset)."…";                return mb_substr($str, $start, $length, $charset).$next_str;            else                return mb_substr($str, $start, $length, $charset);        }elseif(function_exists('iconv_substr')) {            if($suffix)                // return iconv_substr($str,$start,$length,$charset)."…";                return iconv_substr($str,$start,$length,$charset).$next_str;            else                return iconv_substr($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 $slice."…";        if(!$suffix) return $slice;        return $slice;    }    /**     *用户名*隐藏     *$str = "如来神掌";     *echo cut_str($str, 1, 0).'**'.cut_str($str, 1, -1);     *输出：如**掌    */    function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')    {        if($code == 'UTF-8')        {            $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";            preg_match_all($pa, $string, $t_string);            if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen));            return join('', array_slice($t_string[0], $start, $sublen));        }        else        {            $start = $start*2;            $sublen = $sublen*2;            $strlen = strlen($string);            $tmpstr = '';            for($i=0; $i< $strlen; $i++)            {                if($i>=$start && $i< ($start+$sublen))                {                    if(ord(substr($string, $i, 1))>129)                    {                        $tmpstr.= substr($string, $i, 2);                    }                    else                    {                        $tmpstr.= substr($string, $i, 1);                    }                }                if(ord(substr($string, $i, 1))>129) $i++;            }            //if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";            return $tmpstr;        }    }    /*    *解决json_encode转换中文的问题，在php5.4下json_encode本身解决的这个问题    */    function unescapedUnicode($match)    {        return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');    }    /**    *截取手机号    *demo:13112345678    *return:131****5678    */    function hidtel($phone){        $IsWhat = preg_match('/(0[0-9]{2,3}[-]?[2-9][0-9]{6,7}[-]?[0-9]?)/i',$phone); //固定电话        if($IsWhat == 1){            return preg_replace('/(0[0-9]{2,3}[-]?[2-9])[0-9]{3,4}([0-9]{3}[-]?[0-9]?)/i','$1****$2',$phone);        }else{            return  preg_replace('/(1[358]{1}[0-9])[0-9]{4}([0-9]{4})/i','$1****$2',$phone);        }    }    //获取IP    function getIp()    {        if (isset($_SERVER)){            if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){                $realip = $_SERVER["HTTP_X_FORWARDED_FOR"];            } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {                $realip = $_SERVER["HTTP_CLIENT_IP"];            } else {                $realip = $_SERVER["REMOTE_ADDR"];            }        } else {            if (getenv("HTTP_X_FORWARDED_FOR")){                $realip = getenv("HTTP_X_FORWARDED_FOR");            } else if (getenv("HTTP_CLIENT_IP")) {                $realip = getenv("HTTP_CLIENT_IP");            } else {                $realip = getenv("REMOTE_ADDR");            }        }            return $realip;    }    //把汉字转换为数字    function getUnicodeFromOneUTF8($word)    {        //获取其字符的内部数组表示，所以本文件应用utf-8编码!          //$word = iconv("gb2312", "utf-8", $word);        if (is_array($word))              $arr = $word;          else              $arr = str_split($word);          //此时，$arr应类似array(228, 189, 160)          //定义一个空字符串存储          $bin_str = '';          //转成数字再转成二进制字符串，最后联合起来。          foreach ($arr as $value)              $bin_str .= decbin(ord($value));          //此时，$bin_str应类似111001001011110110100000        //正则截取          $bin_str = preg_replace('/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/','$1$2$3', $bin_str);        //此时， $bin_str应类似0100111101100000,如果是汉字"你"        return bindec($bin_str);          //返回类似20320， 汉字"你"          //return dechex(bindec($bin_str));          //如想返回十六进制4f60，用这句      }