常用的两个PHP类

/**

 * Class Interval

 * @author logonmy

 * @desc  简单分析程序执行时间；

 */

Class Interval{

    var $start;

    public function getTrueTime()

    {

        list($sec,$unix) = explode(' ',microtime());

        return (float)$unix+(float)$sec;

    }

    public function __construct()

    {

        $this->start = $this->getTrueTime();

    }

    public function spend()

    {

        return round($this->getTrueTime() - $this->start,4);

    }

}

Class GetIpToCity{

    var $city;//获取ip对应城市，本单位网络平均用时0.3秒；

    public function __construct()

    {

        $this->city = $this->get_ip_to_city();

    }

    public function get_ip_to_city()

    {

        $city = '';

        $ip = $this->getip();

        $ip_api = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip';

        $json_data = file_get_contents($ip_api.$ip);

        $ip_data = json_decode($json_data,true);

        $city = $ip_data['city'];

        return $city;

    }

    ////获得访客真实ip

    public function getip(){

        if(!empty($_SERVER["HTTP_CLIENT_IP"])){

            $ip = $_SERVER["HTTP_CLIENT_IP"];

        }

        if(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){ //获取代理ip

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

        }

        if($ip){

            $ips = array_unshift($ips,$ip);

        }

        $count = count($ips);

        for($i=0;$i<$count;$i++){

            if(!preg_match("/^(10|172\.16|192\.168)\./i",$ips[$i])){//排除局域网ip

                $ip = $ips[$i];

                break;

            }

        }

        $tip = empty($_SERVER['REMOTE_ADDR']) ? $ip : $_SERVER['REMOTE_ADDR'];

        if($tip=="127.0.0.1"){ //获得本地真实IP

            return $this->get_onlineip();

        }else{

            return $tip;

        }

    }

    ////获得本地真实IP

    public function get_onlineip() {

        $mip = file_get_contents("http://iframe.ip138.com/ic.asp");

        if($mip){

            preg_match("/\[.*\]/",$mip,$sip);

            $p = array("/\[/","/\]/");

            return preg_replace($p,"",$sip[0]);

        }else{return null;}

    }

}