Tu propio PageRank para tu Web con PHP

<?php
define('GOOGLE_MAGIC', 0xE6359A60);
 
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 toInt32(& $x){
	$z = hexdec(80000000);
	$y = (int)$x;
	if($y==-$z&&$x<-$z){
		$y = (int)((-1)*$x);
		$y = (-1)*$y;
	}
	$x = $y;
}
 
function mix($a,$b,$c)
{
	$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,13)));
	$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<8));
	$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (zeroFill($b,13)));
	$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,12)));
	$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<16));
	$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (zeroFill($b,5)));
	$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,3)));
	$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<10));
	$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (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));
		$mix = mix($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 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 get_page_rank($url)
{
	$url = preg_replace('/\?.*$/','?',$url);
	$reqgr = "info:".$url;
	$reqgre = "info:".urlencode($url);
	$gch = "6".GoogleCH(strord($reqgr));
	$fsock = fsockopen('toolbarqueries.google.com', 80, $errno, $errstr);
	if ( !$fsock ){
		echo 'Can not connect to server';
		return -1;
	}
	$base_get = "/search?client=navclient-auto&ch=".$gch."&ie=UTF-8&oe=UTF-8&features=Rank:FVN&q=".$reqgre;
	fputs($fsock, "GET $base_get HTTP/1.1\r\n");
	fputs($fsock, "HOST: toolbarqueries.google.com\r\n");
	fputs($fsock, "User-Agent: Mozilla/4.0 (compatible; GoogleToolbar 2.0.114-big; Windows XP 5.1)\r\n");
	fputs($fsock, "Connection: close\r\n\r\n");
	while(!feof($fsock)){
		$res['content'] .= fread($fsock, 1024);
	}
	fclose($fsock);
	if(preg_match('/Rank_.*?:.*?:(\d+)/i', $res['content'], $m)){
		return $m[1];
	}else{
		return -1;
	}
}
?>

<?php
include("check_pr.php");
$dominio = "http://www.zoneartcss.com";
$pagerank = get_page_rank($dominio);
 
echo "<b>PageRank:</b>: ".$pagerank; //Imprimimos los resultados
?>