PHP: Determination of the country by IP

PHP: Determination of the country by IP by IP using geoplugin. net OR ipinfodb. com - return the country code in "Alpha-2 ISO 3166-1" format (a two-char code)

1. function get_country($ip_addr) {
2. $curlopt_useragent = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0';
3. $url = 'http://www.geoplugin.net/php.gp?ip=' . $ip_addr;
4. $ch1 = curl_init();
5. curl_setopt($ch1, CURLOPT_URL, $url);
6. curl_setopt($ch1, CURLOPT_RETURNTRANSFER, 1);
7. $result = curl_exec($ch1);
8. $geoplugin = unserialize($result);
9.  
10. if ($geoplugin[geoplugin_countryCode] != '') {
11. return $geoplugin[geoplugin_countryCode];
12. } else {
13. $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip_addr);
14. $ch = curl_init();
15.  
16. $curl_opt = array(
17. CURLOPT_FOLLOWLOCATION => 1,
18. CURLOPT_HEADER => 0,
19. CURLOPT_RETURNTRANSFER => 1,
20. CURLOPT_USERAGENT => $curlopt_useragent,
21. CURLOPT_URL => $url,
22. CURLOPT_TIMEOUT => 1,
23. CURLOPT_REFERER => 'http://' . $_SERVER['HTTP_HOST'],
24. );
25. curl_setopt_array($ch, $curl_opt);
26. $content = curl_exec($ch);
27.  
28. if (!is_null($curl_info)) {
29. $curl_info = curl_getinfo($ch);
30. }
31.  
32. curl_close($ch);
33.  
34. if (preg_match('{<li>Country : ([^<]*)}i', $content, $regs))
35. $country = $regs[1];
36.  
37. return $country;
38. }
39. }