PageRank revisat

Com haureu pogut observar, al menú de la dreta, per sobre del calendari, us mostro el PageRank del meu weblog... sense necessitat de tenir la ToolBar de Google!

I què significa això? Doncs que utilitzo un codi PHP, juntament amb SSI per calcular-lo i mostrar-vos-el.

Voleu veure el codi?

define('GMAG', 0xE6359A60);

//unsigned shift right

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; $a ^= (zeroFill($c,13));

  $b -= $c; $b -= $a; $b ^= ($a<<8);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,13));

  $a -= $b; $a -= $c; $a ^= (zeroFill($c,12));

  $b -= $c; $b -= $a; $b ^= ($a<<16);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,5));

  $a -= $b; $a -= $c; $a ^= (zeroFill($c,3));

  $b -= $c; $b -= $a; $b ^= ($a<<10);

  $c -= $a; $c -= $b; $c ^= (zeroFill($b,15));

return array($a,$b,$c);

}


function GCH($url, $length=null, $init=GMAG){

  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));

    $mix = mix($a,$b,$c);

    $a = $mix[0]; $b = $mix[1]; $c = $mix[2];

    $k += 12;

    $len -= 12;

  }

  $c += $length;

  switch($len){  // all the case statements fall through

    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]);

      // case 0: nothing left to add

  }

  $mix = mix($a,$b,$c);

    // report the result

  return $mix[2];

}


//converts a string into an array of integers (the numeric

//value of the char)

function strord($string){

  for($i=0;$i

    $result[$i] = ord($string{$i});

  }

  return $result;

}


function getPR($_url){

  $url = 'info:'.$_url;

  $ch = GCH(strord($url));

  $url='info:'.urlencode($_url);

  $pr = file("http://www.google.com/search?client=

    navclient-auto&ch=6$ch&ie=UTF-8&oe=UTF-8&

    features=Rank&q=$url");

  $pr_str = implode("", $pr);

  return substr($pr_str,strrpos($pr_str, ":")+1);

}

echo "Mi PR es: ".getPR("http://www.albertlg.com/blog/")."";

?>