//ustawienia - host i user agent
$googlehost='toolbarqueries.google.com';
$googleua='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/3.6';

function strtonum($Str, $check, $Magic) {
  $intunit = 4294967296;  // 2^32
  $length = strlen($Str);

for ($i = 0; $i < $length; $i++) {
  $check *= $Magic;

if ($check >= $intunit) {
  $check = ($check - $intunit * (int) ($check / $intunit));
  $check = ($check < -2147483648) ? ($check + $intunit) : $check;
}

  $check += ord($Str{$i});
}
  return $check;
}

//hash for a url
function hashURL($String) {
  $check1 = strtonum($String, 0x1505, 0x21);
  $check2 = strtonum($String, 0, 0x1003F);
  $check1 >>= 2;
  $check1 = (($check1 >> 4) & 0x3FFFFC0 ) | ($check1 & 0x3F);
  $check1 = (($check1 >> 4) & 0x3FFC00 ) | ($check1 & 0x3FF);
  $check1 = (($check1 >> 4) & 0x3C000 ) | ($check1 & 0x3FFF);  
  $T1 = (((($check1 & 0x3C0) << 4) | ($check1 & 0x3C)) <<2 ) | ($check2 & 0xF0F );
  $T2 = (((($check1 & 0xFFFFC000) << 4) | ($check1 & 0x3C00)) << 0xA) | ($check2 & 0xF0F0000 );

return ($T1 | $T2);
}

//checksum for the hash string
function checkHash($Hashnum) {
  $checkByte = 0;
  $flag = 0;
  $hashStr = sprintf('%u', $Hashnum);
  $length = strlen($hashStr);

for ($i = $length - 1;  $i >= 0;  $i --) {
  $re = $hashStr{$i};

if (1 === ($flag % 2)) {
  $re += $re;
  $re = (int)($re / 10) + ($re % 10);
}
  $checkByte += $re;
  $flag ++;
}

$checkByte %= 10;
if (0 !== $checkByte) {
  $checkByte = 10 - $checkByte;

if (1 === ($flag % 2) ) {
  if (1 === ($checkByte % 2)) {
  $checkByte += 9;
  }

$checkByte >>= 1;
}
}
  return '7'.$checkByte.$hashStr;
}

//pagerank checksum hash
function getHash($url) { return checkHash(hashURL($url)); }

//pagerank figure
function getPagerank($url) {
  global $googlehost,$googleua;
        $ch = getHash($url);
        $fp = fsockopen($googlehost, 80, $errno, $errstr, 30);
if ($fp) {
  $out = "GET /search?client=navclient-auto&ch=$ch&features=Rank&q=info:$url HTTP/1.1\r\n";
  $out .= "User-Agent: $googleua\r\n";
  $out .= "Host: $googlehost\r\n";
  $out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
 
while (!feof($fp)) {
  $data = fgets($fp, 128);
  $pos = strpos($data, "Rank_");

if($pos === false){} else{
  $pr=substr($data, $pos + 9);
  $pr=trim($pr);
  $pr=str_replace("\n",'',$pr);
return $pr;
}
}

fclose($fp);
}
}
?>

function GetPageRank($q,$host='toolbarqueries.google.com',$context=NULL) {
        $seed = "Mining PageRank is AGAINST GOOGLE'S TERMS OF SERVICE. Yes, I'm talking to you, scammer.";
        $result = 0x01020345;
        $len = strlen($q);
        for ($i=0; $i<$len; $i++) {
                $result ^= ord($seed{$i%strlen($seed)}) ^ ord($q{$i});
                $result = (($result >> 23) & 0x1ff) | $result << 9;
        }
        $ch=sprintf('8%x', $result);
        $url='http://%s/tbr?client=navclient-auto&ch=%s&features=Rank&q=info:%s';
        $url=sprintf($url,$host,$ch,$q);
        @$pr=file_get_contents($url,false,$context);
        return $pr?substr(strrchr($pr, ':'), 1):false;
}

//Example usage:
if (isset($_GET['q'])) { echo GetPageRank($_GET['q']); }
//eof