How do you detect a website visitor's country (Specifically, US or not)?

I need to show different links for US and non-US visitors to my site. This is for convenience only, so I am not looking for a super-high degree of accuracy, and security or spoofing are not a concern.

I know there are geotargeting services and lists, but this seems like overkill since I only need to determine (roughly) if the person is in the US or not.

I was thinking about using JavaScript to get the user's timezone, but this appears to only give the offset, so users in Canada, Mexico, and South America would have the same value as people in the US.

Are there any other bits of information availab开发者_如何学Gole either in JavaScript, or PHP, short of grabbing the IP address and doing a lookup, to determine this?

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There are some free services out there that let you make country and ip-based geolocalization from the client-side.

I've used the wipmania free JSONP service, it's really simple to use:

<script type="text/javascript">
  // plain JavaScript example
  function jsonpCallback(data) { 
    alert('Latitude: ' + data.latitude + 
          '\nLongitude: ' + data.longitude + 
          '\nCountry: ' + data.address.country); 
  }
</script>
<script src="http://api.wipmania.com/jsonp?callback=jsonpCallback"
        type="text/javascript"></script>

Or if you use a framework that supports JSONP, like jQuery you can:

// jQuery example
$.getJSON('http://api.wipmania.com/jsonp?callback=?', function (data) { 
  alert('Latitude: ' + data.latitude + 
        '\nLongitude: ' + data.longitude + 
        '\nCountry: ' + data.address.country); 
});

Check the above snippet running here.

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The best indicator is probably the HTTP Accept-Language header. It will look something like below in the HTTP request:

GET / HTTP/1.1
Accept: */*
Accept-Language: en-us
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.21022; .NET CLR 3.5.30729; MDDC; OfficeLiveConnector.1.4; OfficeLivePatch.0.0; .NET CLR 3.0.30729)
Accept-Encoding: gzip, deflate
Host: www.google.com
Connection: Keep-Alive

You should be able to retrieve this in PHP using the following:

<?php
echo $_SERVER['HTTP_ACCEPT_LANGUAGE'];
?>

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I would say that geotargetting is the only method that's even remotely reliable. But there are also cases where it doesn't help at all. I keep getting to sites that think I'm in France because my company's backbone is there and all Internet traffic goes through it.

The HTTP Accept Header is not enough to determine the user locale. It only tells you what the user selected as their language, which may have nothing to do with where they are. More on this here.

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Wipmania.com & PHP

<?php
$site_name = "www.your-site-name.com";

function getUserCountry() {
    $fp = fsockopen("api.wipmania.com", 80, $errno, $errstr, 5);
    if (!$fp) {
        // API is currently down, return as "Unknown" :(
        return "XX";
    } else {
        $out = "GET /".$_SERVER['REMOTE_ADDR']."?".$site_name." HTTP/1.1\r\n";
        $out .= "Host: api.wipmania.com\r\n";
        $out .= "Typ: php\r\n";
        $out .= "Ver: 1.0\r\n";
        $out .= "Connection: Close\r\n\r\n";
        fwrite($fp, $out);
        while (!feof($fp)) {
            $country = fgets($fp, 3);
        }
        fclose($fp);
        return $country;
    }
}
?>

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@rostislav

or using cURL:

public function __construct($site_name) {
    // create a new cURL resource
    $ch = curl_init();

    // set URL and other appropriate options
    curl_setopt($ch, CURLOPT_POST, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: text/xml"));
    curl_setopt($ch, CURLOPT_URL, "http://api.wipmania.com".$_SERVER['REMOTE_ADDR']."?".$site_name);
    curl_setopt($ch, CURLOPT_HEADER, 0);

    // grab URL and pass it to the browser
    $response = curl_exec($ch);
    $info = curl_getinfo($ch,CURLINFO_HTTP_CODE);

    if (($response === false) || ($info !== 200)) {
        throw new Exception('HTTP Error calling Wipmania API - HTTP Status: ' . $info . ' - cURL Erorr: ' . curl_error($ch));
    } elseif (curl_errno($ch) > 0) {
        throw new Exception('HTTP Error calling Wipmania API - cURL Error: ' . curl_error($ch));
    }

    $this->country = $response;

    // close cURL resource, and free up system resources
    curl_close($ch);
}

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Simply we can use Hostip API

<?php $country_code = file_get_contents("http://api.hostip.info/country.php"); <br/>if($country_code == "US"){ echo "You Are USA"; } <br/>else{ echo "You Are Not USA";} ?>

All Country codes are here.. http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

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My solution, easy and small, in this example i test Canada region from language fr-CA or en-CA

if( preg_match( "/^[a-z]{2}\-(ca)/i", $_SERVER[ "HTTP_ACCEPT_LANGUAGE" ] ) ){

   $region = "Canada";

}

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Depending on which countries you want to distinguish, time zones can be a very easy way to achieve it - and I assume it's quite reliable as most people will have the clocks on their computers set right. (Though of course there are many countries you can't distinguish using this technique).

Here's a really simple example of how to do it:

http://unmissabletokyo.com/country-detector