location.php

<?php
/**
 * PHP: Detect location by IP
 * http://www.catswhocode.com/blog/10-super-useful-php-snippets-you-probably-havent-seen
 */

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;
    }
}