Google PageRank backup

1. <?php
   
2. 
   
3. define('GMAG', 0xE6359A60);
   
4. 
   
5. //unsigned shift right
   
6. function zeroFill($a, $b)
   
7. {
   
8.     $z = hexdec(80000000);
   
9.         if ($z & $a)
   
10.         {
    
11.             $a = ($a>>1);
    
12.             $a &= (~$z);
    
13.             $a |= 0x40000000;
    
14.             $a = ($a>>($b-1));
    
15.         }
    
16.         else
    
17.         {
    
18.             $a = ($a>>$b);
    
19.         }
    
20.         return $a;
    
21. }
    
22. 
    
23. 
    
24. function mix($a,$b,$c) {
    
25.   $a -= $b; $a -= $c; $a ^= (zeroFill($c,13));
    
26.   $b -= $c; $b -= $a; $b ^= ($a<<8);
    
27.   $c -= $a; $c -= $b; $c ^= (zeroFill($b,13));
    
28.   $a -= $b; $a -= $c; $a ^= (zeroFill($c,12));
    
29.   $b -= $c; $b -= $a; $b ^= ($a<<16);
    
30.   $c -= $a; $c -= $b; $c ^= (zeroFill($b,5));
    
31.   $a -= $b; $a -= $c; $a ^= (zeroFill($c,3));  
    
32.   $b -= $c; $b -= $a; $b ^= ($a<<10);
    
33.   $c -= $a; $c -= $b; $c ^= (zeroFill($b,15));
    
34.   
    
35.   return array($a,$b,$c);
    
36. }
    
37. 
    
38. function GCH($url, $length=null, $init=GMAG) {
    
39.     if(is_null($length)) {
    
40.         $length = sizeof($url);
    
41.     }
    
42.     $a = $b = 0x9E3779B9;
    
43.     $c = $init;
    
44.     $k = 0;
    
45.     $len = $length;
    
46.     while($len >= 12) {
    
47.         $a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
    
48.         $b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
    
49.         $c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
    
50.         $mix = mix($a,$b,$c);
    
51.         $a = $mix[0]; $b = $mix[1]; $c = $mix[2];
    
52.         $k += 12;
    
53.         $len -= 12;
    
54.     }
    
55. 
    
56.     $c += $length;
    
57.     switch($len)              /* all the case statements fall through */
    
58.     {
    
59.         case 11: $c+=($url[$k+10]<<24);
    
60.         case 10: $c+=($url[$k+9]<<16);
    
61.         case 9 : $c+=($url[$k+8]<<8);
    
62.           /* the first byte of c is reserved for the length */
    
63.         case 8 : $b+=($url[$k+7]<<24);
    
64.         case 7 : $b+=($url[$k+6]<<16);
    
65.         case 6 : $b+=($url[$k+5]<<8);
    
66.         case 5 : $b+=($url[$k+4]);
    
67.         case 4 : $a+=($url[$k+3]<<24);
    
68.         case 3 : $a+=($url[$k+2]<<16);
    
69.         case 2 : $a+=($url[$k+1]<<8);
    
70.         case 1 : $a+=($url[$k+0]);
    
71.          /* case 0: nothing left to add */
    
72.     }
    
73.     $mix = mix($a,$b,$c);
    
74.     /*-------------------------------------------- report the result */
    
75.     return $mix[2];
    
76. }
    
77. 
    
78. //converts a string into an array of integers containing the numeric value of the char
    
79. function strord($string) {
    
80.     for($i=0;$i<strlen($string);$i++) {
    
81.         $result[$i] = ord($string{$i});
    
82.     }
    
83.     return $result;
    
84. }
    
85. 
    
86. function getPR($_url) {
    
87.     $url = 'info:'.$_url;
    
88.     $ch = GCH(strord($url));
    
89.     $url='info:'.urlencode($_url);
    
90.     $pr = file("http://www.google.com/search?client=navclient-auto&ch=6$ch&ie=UTF-8&oe=UTF-8&features=Rank&q=$url");
    
91.     $pr_str = implode("", $pr);
    
92.     return substr($pr_str,strrpos($pr_str, ":")+1);
    
93. }
    
94. 
    
95. 
    
96. echo "The PR of your website is: ".getPR("http://www.example.com");
    
97. 
    
98. ?>
    

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