/**

     * 二维数组按指定字段排序

     *

     * @param array $list

     * @param string $field

     * @param string $sortby

     */

    public static function sortArrayByField($list, $field, $sortby = 'asc')

    {

        if (is_array($list)) {

            $refer = $resultSet = array();

            foreach ($list as $i => $data) {

                $refer[$i] = &$data[$field];

            }

            switch ($sortby) {

                case 'asc': // 正向排序

                    asort($refer);

                    break;

                case 'desc': // 逆向排序

                    arsort($refer);

                    break;

                case 'nat': // 自然排序

                    natcasesort($refer);

                    break;

            }

            foreach ($refer as $key => $val) {

                $resultSet[] = &$list[$key];

            }

            return $resultSet;

        }

        return false;

    }

/**

     * 判断并转换字符编码，需 mb_string 模块支持。

     *

     * @param mixed $str

     *            数据

     * @param string $encoding

     *            要转换的编码类型

     * @return mixed 转换过的数据

     */

    public function encoding_convert($str, $encoding = 'UTF-8')

    {

        if (is_array($str)) {

            $arr = array();

            foreach ($str as $key => $val) {

                $arr[$key] = self::encoding_convert($val, $encoding);

            }

            return $arr;

        }

        $_encoding = mb_detect_encoding($str, array(

            'ASCII',

            'UTF-8',

            'GB2312',

            'GBK',

            'BIG5'

        ));

        if ($_encoding == $encoding) {

            return $str;

        }

        try {

            $str = @mb_convert_encoding($str, $encoding, $_encoding);

        } catch (Exception $e) {

            // nothing todo

        }

        return $str;

    }

/**

     * 获取客户端ip

     * @return string

     */

    public static function get_ip(){

        static $realip = NULL;

        if ($realip !== NULL) return $realip;

        if (isset($_SERVER)) {

            if(isset($_SERVER['HTTP_X_REAL_IP']) && $_SERVER['HTTP_X_REAL_IP']){

                $realip = $_SERVER['HTTP_X_REAL_IP'];

            }elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR']) {

                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

                foreach ($arr AS $ip) {

                    $ip = trim($ip);

                    if ($ip != 'unknown') {

                        $realip = $ip;

                        break;

                    }

                }

            } elseif (isset($_SERVER['HTTP_CLIENT_IP']) && $_SERVER['HTTP_CLIENT_IP']) {

                $realip = $_SERVER['HTTP_CLIENT_IP'];

            } else {

                $realip = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '0.0.0.0';

            }

        } else {

            if (getenv('HTTP_X_REAL_IP')){

                $realip = getenv('HTTP_X_REAL_IP');

            }elseif (getenv('HTTP_X_FORWARDED_FOR')) {

                $realip = getenv('HTTP_X_FORWARDED_FOR');

            } elseif (getenv('HTTP_CLIENT_IP')) {

                $realip = getenv('HTTP_CLIENT_IP');

            } else {

                $realip = getenv('REMOTE_ADDR');

            }

        }

        $onlineip = array();

        preg_match("/[\\d\\.]{7,15}/", $realip, $onlineip);

        return !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

    }

//off().on()

 $('.demo').off().on('click',function(){

 })

 

//die().live() 

$('.demo').die().live('click',function(){

 })

//直接绑定body 然后找选择器   

$('body').on("click",".demo",function(){

    //code

})

/**

     *

     * @param $filename 要导出的文件名

     * @param $firstline 第一行内容数组

     *            eg $firstline = ['姓名','性别','年龄'];

     * @param $data 要导出的内容数组

     *            二维数组 eg [['name'=>'xx','sex'=>'xx','1'],['name'=>'xx','sex'=>'xx','1']]

     */

    public static function export_csv($filename, $firstlinearr, $dataarr)

    {

        $str = '';

        foreach ($firstlinearr as $first) {

            $first = str_replace(array("\r\n", "\r", "\n"), '', $first);

            $str .= ',' . iconv('utf-8', 'gbk//IGNORE', $first); // 中文转码

        }

        $str = ltrim($str, ',') . "\n";

        foreach ($dataarr as $val) {

            $valuestr = '';

            foreach ($val as $value) {

                $value = str_replace(array("\r\n", "\r", "\n"), '', $value);

                $valuestr .= ',' . iconv('utf-8', 'gbk//IGNORE', $value); // 中文转码

            }

            $str .= ltrim($valuestr, ',') . "\n";

        }

        $filename = $filename . date('YmdHis') . '.csv'; // 设置文件名

        header("Content-type:text/csv");

        header("Content-Disposition:attachment;filename=" . $filename);

        header('Cache-Control:must-revalidate,post-check=0,pre-check=0');

        header('Expires:0');

        header("Pragma: no-cache");

        echo $str;

        exit();

    }