/**
 * 根据IP查找地址
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
function detect_city($ip) {
        $default = 'UNKNOWN';
        if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')
            $ip = '8.8.8.8';
        $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';
        $url = 'http://ipinfodb.com/ip_locator.PHP?ip=' . urlencode($ip);
        $ch = curl_init();
        $curl_opt = array(
            CURLOPT_FOLLOWLOCATION  => 1,CURLOPT_HEADER      => 0,CURLOPT_RETURNTRANSFER  => 1,CURLOPT_USERAGENT   => $curlopt_useragent,CURLOPT_URL       => $url,CURLOPT_TIMEOUT         => 1,CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],);
        curl_setopt_array($ch,$curl_opt);
        $content = curl_exec($ch);
        if (!is_null($curl_info)) {
            $curl_info = curl_getinfo($ch);
        }
        curl_close($ch);
        if ( preg_match('{<li>City : ([^<]*)</li>}i',$content,$regs) )  {
            $city = $regs[1];
        }
        if ( preg_match('{<li>State/Province : ([^<]*)</li>}i',$regs) )  {
            $state = $regs[1];
        }
        if( $city!='' && $state!='' ){
          $location = $city . ',' . $state;
          return $location;
        }else{
          return $default;
        }
    }