function Alexa($domain) {
    //define vars
    $return = 0;
    $serviceURL = 'http://awis.amazonaws.com/onca/xml';

    $service = "AlexaWebInfoService";
    $operation = "UrlInfo";
    $timestamp = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time()); // Timestamp format: yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
    $signature = '';
    $secretAccessKey = 'YOUR SECRET KEY';
    $signature = urlencode(calculate_RFC2104HMAC($service.$operatio  n.$timestamp,$secretAccessKey));
    $timestamp = urlencode($timestamp);

    // construct the query
    $q = '?Service='.$service
        .'&AWSAccessKeyId=YOUR PUBLIC KEY'
        .'&Operation='.$operation
        .'&ResponseGroup=Rank'
        .'&Url=www.'.$domain
        .'&Timestamp='.$timestamp
        .'&Signature='.$signature;

    // get the xml results
    $fetchURL = $serviceURL.$q;

    if(!$xml = @file_get_contents($fetchURL)) {
        $file = @file($fetchURL);
        $xml = implode("", $file);
    }
//    echo $xml;
    // if the result was invalid, meaning API key expired
    if(strstr('<IsValid>False</IsValid>', $xml)) {
        $xml = '<Rank>-1</Rank>';
    }

    // find the rank
    preg_match('/\<Rank\>(\d+)\<\/Rank\>/', $xml, $result);
    $return = $result[1];

    // return the results
    return "$return";
}

function calculate_RFC2104HMAC ($data, $key) {
    return base64_encode (
        pack("H*", sha1((str_pad($key, 64, chr(0x00))
        ^(str_repeat(chr(0x5c), 64))) .
        pack("H*", sha1((str_pad($key, 64, chr(0x00))
        ^(str_repeat(chr(0x36), 64))) . $data))))
     );
}

 $apr=Alexa("namepros.com");
 echo "Alexa Rank for namepros.com is: ".$apr."<br>";