1: <?php

   2: // 7/25/2008 - Updated by Askie (http://www.pkphp.com/)

   3: // 3/20/2008 - Updated by Roger Collins (http://www.rogercollins.com/)

   4: // to remove graphing step

   5:  

   6: //PageRank Lookup v1.1 by HM2K (update: 31/01/07)

   7: //based on an alogoritham found here: http://pagerank.gamesaga.net/

   8:  

   9: class PageRank

  10: {

  11: //settings - host and user agent

  12: var $googlehost='toolbarqueries.google.com';

  13: var $googleua='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5';

  14:  

  15: //convert a string to a 32-bit integer

  16: function StrToNum($Str, $Check, $Magic) {

  17:     $Int32Unit = 4294967296;  // 2^32

  18:  

  19:     $length = strlen($Str);

  20:     for ($i = 0; $i < $length; $i++) {

  21:         $Check *= $Magic;     

  22:         //If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31), 

  23:         //  the result of converting to integer is undefined

  24:         //  refer to http://www.php.net/manual/en/language.types.integer.php

  25:         if ($Check >= $Int32Unit) {

  26:             $Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));

  27:             //if the check less than -2^31

  28:             $Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;

  29:         }

  30:         $Check += ord($Str{$i}); 

  31:     }

  32:     return $Check;

  33: }

  34:  

  35: //genearate a hash for a url

  36: function HashURL($String) {

  37:     $Check1 = $this->StrToNum($String, 0x1505, 0x21);

  38:     $Check2 = $this->StrToNum($String, 0, 0x1003F);

  39:  

  40:     $Check1 >>= 2;     

  41:     $Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);

  42:     $Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);

  43:     $Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF);    

  44:     

  45:     $T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );

  46:     $T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000 );

  47:     

  48:     return ($T1 | $T2);

  49: }

  50:  

  51: //genearate a checksum for the hash string

  52: function CheckHash($Hashnum) {

  53:     $CheckByte = 0;

  54:     $Flag = 0;

  55:  

  56:     $HashStr = sprintf('%u', $Hashnum) ;

  57:     $length = strlen($HashStr);

  58:     

  59:     for ($i = $length - 1;  $i >= 0;  $i --) {

  60:         $Re = $HashStr{$i};

  61:         if (1 === ($Flag % 2)) {              

  62:             $Re += $Re;     

  63:             $Re = (int)($Re / 10) + ($Re % 10);

  64:         }

  65:         $CheckByte += $Re;

  66:         $Flag ++;    

  67:     }

  68:  

  69:     $CheckByte %= 10;

  70:     if (0 !== $CheckByte) {

  71:         $CheckByte = 10 - $CheckByte;

  72:         if (1 === ($Flag % 2) ) {

  73:             if (1 === ($CheckByte % 2)) {

  74:                 $CheckByte += 9;

  75:             }

  76:             $CheckByte >>= 1;

  77:         }

  78:     }

  79:  

  80:     return '7'.$CheckByte.$HashStr;

  81: }

  82:  

  83: //return the pagerank checksum hash

  84: function getch($url) { return $this->CheckHash($this->HashURL($url)); }

  85:  

  86: //return the pagerank figure

  87: function printrank($url) 

  88: {

  89:     $urlinfo=parse_url($url);

  90:     $start=$urlinfo["scheme"]<>""?strlen($urlinfo["scheme"]."://"):0;

  91:     $url=substr($url,$start);

  92:     

  93:     $pr = 0;    // default return

  94:     $ch = $this->getch($url);

  95:     $fp = fsockopen($this->googlehost, 80, $errno, $errstr, 30);

  96:     if ($fp) {

  97:        $out = "GET /search?client=navclient-auto&ch=$ch&features=Rank&q=info:$url HTTP/1.1
";

  98:        //echo "<pre>$out</pre>
"; //debug only

  99:        $out .= "User-Agent: {$this->googleua}
";

 100:        $out .= "Host: {$this->googlehost}
";

 101:        $out .= "Connection: Close

";

 102:     

 103:        fwrite($fp, $out);

 104:        

 105:        //$pagerank = substr(fgets($fp, 128), 4); //debug only

 106:        //echo $pagerank; //debug only

 107:        while (!feof($fp)) {

 108:             $data = fgets($fp, 128);

 109:             //echo $data;

 110:             $pos = strpos($data, "Rank_");

 111:             if($pos === false){} else{

 112:                 $pr=substr($data, $pos + 9);

 113:                 $pr=trim($pr);

 114:                 $pr=str_replace("
",'',$pr);

 115:                 return $pr;

 116:             }

 117:        }

 118:        //else { echo "$errstr ($errno)<br />
"; } //debug only

 119:        fclose($fp);

 120:     }

 121:     return $pr;

 122:     }

 123: }

 124: //$gpr = new PageRank();

 125: //print_r($gpr->printrank("http://www.pkphp.com/"));