php pagerank checker script

a great php class to check page rank for any website, only include the class file and get PageRank.

pagerank_checker.php

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<?php
 
class GooglePR {
 public function get_google_pagerank($url) {
     $query="http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=".
$this->CheckHash($this->HashURL($url)). "&features=Rank&q=info:".$url."&num=100&filter=0";
    // echo $query;
     $data=file_get_contents($query);
     $pos = strpos($data, "Rank_");
     if($pos === false){} else{
         $pagerank = substr($data, $pos + 9);
         return $pagerank;
     }
 }
 
 public function StrToNum($Str, $Check, $Magic){
     $Int32Unit = 4294967296; // 2^32
     $length = strlen($Str);
     for ($i = 0; $i < $length; $i++) {
     $Check *= $Magic;
     if ($Check >= $Int32Unit) {
         $Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
         $Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
         }
     $Check += ord($Str{$i});
     }
     return $Check;
 }
 
 public function HashURL($String) {
     $Check1 = $this->StrToNum($String, 0x1505, 0x21);
     $Check2 = $this->StrToNum($String, 0, 0x1003F);
     $Check1 >>= 2;
     $Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);
     $Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);
     $Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF);
     $T1 =(((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );
     $T2 =(((($Check1 & 0xFFFFC000)<< 4)| ($Check1 & 0x3C00))<< 0xA)| ($Check2 & 0xF0F0000);
     return ($T1 | $T2);
 }
 
 public function CheckHash($Hashnum){
     $CheckByte = 0;
     $Flag = 0;
     $HashStr = sprintf('%u', $Hashnum) ;
     $length = strlen($HashStr);
     for ($i = $length - 1; $i >= 0; $i --) {
         $Re = $HashStr{$i};
         if (1 === ($Flag % 2)) {
             $Re += $Re;
             $Re = (int)($Re / 10) + ($Re % 10);
             }
         $CheckByte += $Re;
         $Flag ++;
         }
     $CheckByte %= 10;
     if (0 !== $CheckByte) {
         $CheckByte = 10 - $CheckByte;
         if (1 === ($Flag % 2) ) {
             if (1 === ($CheckByte % 2)) {
                $CheckByte += 9;
             }
             $CheckByte >>= 1;
         }
     }
     return '7'.$CheckByte.$HashStr;
     }
}
?>


test.php

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<?php
 
include "pagerank_checker.php";
 
$url='http://www.facebook.com';
$pr = new GooglePR();
echo "$url has PageRank: ". $pr->get_google_pagerank($url) ;
 
?>
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