Google PageRank Checksum Calculator

HelloWorld · #1 (**permalink**) 07-14-2007, 10:42 PM

I haven't tried this code yet, but yet I think is interesting and pretty useful for programmers. So I guess I should post it here, I found it from somewhere else, but they say that it's an open source...

enjoy and hopefully it's helpful...

PHP Code:

  <?php  

/*  

    This code is released unto the public domain  

*/  

header("Content-Type: text/plain; charset=utf-8");  

define('GOOGLE_MAGIC', 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 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;  

}  

// [url=http://www.example.com/]Example Web Page[/url] - Checksum: 6540747202  

$url = 'info:'.$_GET['url'];  

print("url:\t{$_GET['url']}\n");  

$ch = GoogleCH(strord($url));  

printf("ch:\t6%u\n",$ch);  

?>

The code will basically check the PageRank of a website

Lee · #2 (**permalink**) 07-15-2007, 04:36 AM

And if you dont understand how to use that theres always the easy way out, get the google toolbar, go to the page you want to see the rank of and there you go its shown in your google toolbar

chrishirst · #3 (**permalink**) 07-18-2007, 11:19 PM

Quote:

The code will basically check the PageRank of a website

Websites don't have PageRank.

PageRank is assigned to individual webpages or more correctly to distinct and individual URIs.
A trifling but important distinction.

Now if there was some way of reading the REAL PR of a page, that would be interesting.

HelloWorld · #4 (**permalink**) 07-19-2007, 10:03 AM

Quote:

Now if there was some way of reading the REAL PR of a page, that would be interesting.

what do you mean by REAL PR ???
Are you talking about the PR that Google gave, or our own rated PR

based on the quality of the site..? but based on what?

Lee · #5 (**permalink**) 07-19-2007, 10:19 AM

Quote:

Originally Posted by HelloWorld

what do you mean by REAL PR ???
Are you talking about the PR that Google gave, or our own rated PR

based on the quality of the site..? but based on what?

Think he means PR from everything, all the net, papers, tv, member base etc etc, googles as far as i know is based on some net things but thats about it.

chrishirst · #6 (**permalink**) 07-20-2007, 08:07 AM

Nope

real PR is the actual value of PageRank that Google uses as one small part of the ranking algo.

The useless, out of date, inaccurate green bar that everyone is obsessed with isn't anything to do with what the real value is

ccoonen · #7 (**permalink**) 07-20-2007, 08:24 PM

remember, not all pagerank datacenters are the same - you need to hitmuliple datacenters (google pr server ips) for a correct pr

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How to test for Google PageRank	This thread	Refback	07-25-2007 08:20 PM