Hashing algoriths for Page Rank

pagerank.php

<?php
// Function d checks
function d($a, $b) {
	//$c = intval(8E7, 16);//80000000
	$c = 2147483648;
	if ($c & $a) {
		$a >>= 1;
		$a &= ~$c;
		$a = $a | 1073741824;
		$a >>= $b - 1;
	}
	else  $a >>= $b;
	return $a;
}

// function g checks
function g($a, $b, $c) {
	$a -= $b;
	$a -= $c;
	$a ^= d($c, 13);
	$b -= $c;
	$b -= $a;
	$b ^= $a << 8;
	$c -= $a;
	$c -= $b;
	$c ^= d($b, 13);
	$a -= $b;
	$a -= $c;
	$a ^= d($c, 12);
	$b -= $c;
	$b -= $a;
	$b ^= $a << 16;
	$c -= $a;
	$c -= $b;
	$c ^= d($b, 5);
	$a -= $b;
	$a -= $c;
	$a ^= d($c, 3);
	$b -= $c;
	$b -= $a;
	$b ^= $a << 10;
	$c -= $a;
	$c -= $b;
	$c ^= d($b, 15);
	
	$ret = array($a, $b, $c);
	return $ret;
}

function a($a) {
        $length = count($a);
       	$b = 2654435769;
       	$c = 2654435769;
       	$d = 3862272608;
       	$e = 0;
       	$h = array();
        for ($f = $length; $f >= 12;) {
        	$b += $a[$e + 0] + ($a[$e + 1] << 8) + ($a[$e + 2] << 16) + ($a[$e + 3] << 24);
        	$c += $a[$e + 4] + ($a[$e + 5] << 8) + ($a[$e + 6] << 16) + ($a[$e + 7] << 24);
        	$d += $a[$e + 8] + ($a[$e + 9] << 8) + ($a[$e + 10] << 16) + ($a[$e + 11] << 24);
        	$h = g($b, $c, $d);
        	$b = $h[0];
        	$c = $h[1];
        	$d = $h[2];
        	$e += 12;
        	$f -= 12;
        }
        $d += $length;
        switch ($f) {
	        case 11:
	            $d += $a[$e + 10] << 24;
	        case 10:
	            $d += $a[$e + 9] << 16;
	        case 9:
	            $d += $a[$e + 8] << 8;
	        case 8:
	            $c += $a[$e + 7] << 24;
	        case 7:
	            $c += $a[$e + 6] << 16;
	        case 6:
	            $c += $a[$e + 5] << 8;
	        case 5:
	            $c += $a[$e + 4];
	        case 4:
	            $b += $a[$e + 3] << 24;
	        case 3:
	            $b += $a[$e + 2] << 16;
	        case 2:
	            $b += $a[$e + 1] << 8;
	        case 1:
	            $b += $a[$e];
        }
        $h = g($b, $c, $d);
        return $h[2] < 0 ? 4294967296 + $h[2] : $h[2];
}

//function b checks
function b($a) {
	$b = array();
	for ($i = 0; $i < strlen($a); $i++)
		$b[$i] = ord($a[$i]);
	return $b;
}

function makehash ($f) {
	$g = b("info:" . $f);
	return a($g);
}
function googlePageRank($f) {
    return "http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=6" . makehash($f) . "&features=Rank&q=info:" . $f;
//        d = new XMLHttpRequest;
//    d.open("GET", f, !1);
//    d.send(null);
//    return d.responseText.substr(9, 2).replace(/\s$/, "")
}

$url = googlePageRank($_GET['url']);
?>

<a href="<?=$url?>"><?=$url?></a>