关于PHP在linux下面获取GOOGLE的PR值

define('GOOGLE_MAGIC', 0xE6359A60);
class pageRank{
var $pr;
function zeroFill($a, $b){
  $z = hexdec(80000000);
  if ($z & $a){
   $a = ($a>>1);
   $a &= (~$z);
   $a |= 0x40000000;
   $a = ($a>>($b-1));
  }else{
   $a = ($a>>$b);
  }
  return $a;
}

function mix($a,$b,$c){
  $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,13));
  $b -= $c; $b -= $a; $b ^= ($a<<8);
  $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,13));
  $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,12));
  $b -= $c; $b -= $a; $b ^= ($a<<16);
  $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,5));
  $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,3));
  $b -= $c; $b -= $a; $b ^= ($a<<10);
  $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,15));
  return array($a,$b,$c);
}

function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC){
  if(is_null($length)) {
   $length = sizeof($url);
  }
  $a = $b = 0x9E3779B9;
  $c = $init;
  $k = 0;
  $len = $length;
  while($len >= 12) {
   $a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
   $b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
   $c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
   $mix = $this->mix($a,$b,$c);
   $a = $mix[0]; $b = $mix[1]; $c = $mix[2];
   $k += 12;
   $len -= 12;
  }
  $c += $length;
  switch($len){
   case 11: $c+=($url[$k+10]<<24);
   case 10: $c+=($url[$k+9]<<16);
   case 9 : $c+=($url[$k+8]<<8);
   /* the first byte of c is reserved for the length */
   case 8 : $b+=($url[$k+7]<<24);
   case 7 : $b+=($url[$k+6]<<16);
   case 6 : $b+=($url[$k+5]<<8);
   case 5 : $b+=($url[$k+4]);
   case 4 : $a+=($url[$k+3]<<24);
   case 3 : $a+=($url[$k+2]<<16);
   case 2 : $a+=($url[$k+1]<<8);
   case 1 : $a+=($url[$k+0]);
  }
  $mix = $this->mix($a,$b,$c);
  /* report the result */
  return $mix[2];
}

//converts a string into an array of integers containing the numeric value of the char

function strord($string){
  for($i=0;$i<strlen($string);$i++) {
   $result[$i] = ord($string{$i});
  }
  return $result;
}

function printrank($url){
  $ch = "6".$this->GoogleCH($this->strord("info:" . $url));

  $fp = fsockopen("www.google.com", 80, $errno, $errstr, 30);
  if(!$fp){
   echo "$errstr ($errno)<br />\n";
  }else{
   $out = "GET /search?client=navclient-auto&ch=" . $ch .  "&features=Rank&q=info:" . $url . " HTTP/1.1\r\n" ;
   $out .= "Host: www.google.com\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{
     $pagerank = substr($data, $pos + 9);
     fclose($fp);
     return array($pagerank,$url);
    }
   }
   fclose($fp);
   return array(0,$url);
  }
}

function printranks($domains){
  foreach($domains as $value){
   $elements[] = $this->printrank($value);
  }
  return $elements;
}
//display pagerank image. Create your own or download images I made for this script. If you make your own make sure to call them pr0.gif, pr1.gif, pr2.gif etc.
function get_pr(){
  return $this->pr;
}
}
$gpr = new pageRank();
var_dump($gpr->printrank("www.chinaz.com"));