Gets Google pagerank of a website

Google_PageRank_Checker.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 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 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) {
		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]);
	}
	$mix = mix($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 $result;
}
function get_pagerank($url)
{
	$ch       = "6" . GoogleCH(strord("info:" . $url));
	$pagerank = 0;
	$fp       = fsockopen("www.google.com", 80, $errno, $errstr, 30);
	if (!$fp) {
		echo "$errstr ($errno)\n";
	} else {
		$out = "GET /tbr?client=navclient-auto&ch=" . $ch . "&features=Rank&q=info:" . $url . " HTTP/1.1\r\n";
		$out .= "Host: toolbarqueries.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, $pos + 9);
				if (substr($pagerank, 0, 2) == "10") {
					$pagerank = "10";
				} else {
					$pagerank = substr($pagerank, 0, 1);
				}
			}
		}
		fclose($fp);
	}
	return $pagerank;
}

print get_pagerank('www.google.com');

?>