通过IP查城市

detect_city_via_ip.php

<?
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', $content, $regs) ) {
            $state = $regs[1];
        }
 
        if( $city!='' && $state!='' ){
          $location = $city . ', ' . $state;
          return $location;
        }else{
          return $default;
        }
 
    }
    
    // sample
    //echo detect_city('113.69.178.14');