PHP获取Google PR值 方法一

51漂泊

这是获取Google PR值的PHP实现版本，经过测试运行正常。将下面代码保存为googlepr.php则读取http://www.51piaobo.com/网站的PR值调用格式为：
googlepr.php?url=www.okbase.net

1. <?php
   
2. 
   
3. //PageRank Lookup v1.1 by HM2K (update: 31/01/07)
   
4. //based on an alogoritham found here: http://pagerank.gamesaga.net/
   
5. 
   
6. //settings - host and user agent
   
7. $googlehost='toolbarqueries.google.com';
   
8. $googleua='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5';
   
9. 
   
10. //字符串转换到32位整数
    
11. function StrToNum($Str, $Check, $Magic) {
    
12.     $Int32Unit = 4294967296;  // 2^32
    
13. 
    
14.     $length = strlen($Str);
    
15.     for ($i = 0; $i < $length; $i++) {
    
16.         $Check *= $Magic;   
    
17.         //If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31),
    
18.         //  the result of converting to integer is undefined
    
19.         //  refer to http://www.php.net/manual/en/language.types.integer.php
    
20.         if ($Check >= $Int32Unit) {
    
21.             $Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
    
22.             //if the check less than -2^31
    
23.             $Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
    
24.         }
    
25.         $Check += ord($Str{$i});
    
26.     }
    
27.     return $Check;
    
28. }
    
29. 
    
30. //将URL进行哈希编码
    
31. function HashURL($String) {
    
32.     $Check1 = StrToNum($String, 0x1505, 0x21);
    
33.     $Check2 = StrToNum($String, 0, 0x1003F);
    
34. 
    
35.     $Check1 >>= 2;   
    
36.     $Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);
    
37.     $Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);
    
38.     $Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF);   
    
39.      
    
40.     $T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );
    
41.     $T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000 );
    
42.      
    
43.     return ($T1 | $T2);
    
44. }
    
45. 
    
46. //为哈希字符串生成校验码
    
47. function CheckHash($Hashnum) {
    
48.     $CheckByte = 0;
    
49.     $Flag = 0;
    
50. 
    
51.     $HashStr = sprintf('%u', $Hashnum) ;
    
52.     $length = strlen($HashStr);
    
53.      
    
54.     for ($i = $length - 1;  $i >= 0;  $i --) {
    
55.         $Re = $HashStr{$i};
    
56.         if (1 === ($Flag % 2)) {              
    
57.             $Re += $Re;     
    
58.             $Re = (int)($Re / 10) + ($Re % 10);
    
59.         }
    
60.         $CheckByte += $Re;
    
61.         $Flag ++;   
    
62.     }
    
63. 
    
64.     $CheckByte %= 10;
    
65.     if (0 !== $CheckByte) {
    
66.         $CheckByte = 10 - $CheckByte;
    
67.         if (1 === ($Flag % 2) ) {
    
68.             if (1 === ($CheckByte % 2)) {
    
69.                 $CheckByte += 9;
    
70.             }
    
71.             $CheckByte >>= 1;
    
72.         }
    
73.     }
    
74. 
    
75.     return '7'.$CheckByte.$HashStr;
    
76. }
    
77. 
    
78. //返回pagerank哈希校验码
    
79. function getch($url) { return CheckHash(HashURL($url)); }
    
80. 
    
81. //返回PR值
    
82. function getpr($url) {
    
83.     global $googlehost,$googleua;
    
84.     $ch = getch($url);
    
85.     $fp = fsockopen($googlehost, 80, $errno, $errstr, 30);
    
86.     if ($fp) {
    
87.        $out = "GET /search?client=navclient-auto&ch=$ch&features=Rank&q=info:$url HTTP/1.1\r\n";
    
88.        //echo "<pre>$out</pre>\n"; //debug only
    
89.        $out .= "User-Agent: $googleua\r\n";
    
90.        $out .= "Host: $googlehost\r\n";
    
91.        $out .= "Connection: Close\r\n\r\n";
    
92.      
    
93.        fwrite($fp, $out);
    
94.         
    
95.        //$pagerank = substr(fgets($fp, 128), 4); //debug only
    
96.        //echo $pagerank; //debug only
    
97.        while (!feof($fp)) {
    
98.             $data = fgets($fp, 128);
    
99.             //echo $data;
    
100.             $pos = strpos($data, "Rank_");
     
101.             if($pos === false){} else{
     
102.                 $pr=substr($data, $pos + 9);
     
103.                 $pr=trim($pr);
     
104.                 $pr=str_replace("\n",'',$pr);
     
105.                 return $pr;
     
106.             }
     
107.        }
     
108.        //else { echo "$errstr ($errno)
     
109. \n"; } //debug only
     
110.        fclose($fp);
     
111.     }
     
112. }
     
113. 
     
114. //生成pagerank图形
     
115. function pagerank($url,$width=40,$method='style') {
     
116.     if (!preg_match('/^(http:\/\/)?([^\/]+)/i', $url)) { $url='http://'.$url; }
     
117.     $pr=getpr($url);
     
118.     $pagerank="PageRank: $pr/10";
     
119. 
     
120.     //The (old) image method
     
121.     if ($method == 'image') {
     
122.     $prpos=$width*$pr/10;
     
123.     $prneg=$width-$prpos;
     
124.     $html='<img src="http://www.google.com/images/pos.gif" width='.$prpos.' height=4 border=0 alt="'.$pagerank.'"><img src="http://www.google.com/images/neg.gif" width='.$prneg.' height=4 border=0 alt="'.$pagerank.'">';
     
125.     }
     
126.     //The pre-styled method
     
127.     if ($method == 'style') {
     
128.     $prpercent=100*$pr/10;
     
129.     $html='<div style="position: relative; width: '.$width.'px; padding: 0; background: #D9D9D9;"><strong style="width: '.$prpercent.'%; display: block; position: relative; background: #5EAA5E; text-align: center; color: #333; height: 4px; line-height: 4px;"><span></span></strong></div>';
     
130.     }
     
131.      
     
132.     $out='<a href="'.$url.'" title="'.$pagerank.'">'.$html.'</a>';
     
133.     return $out;
     
134. }
     
135. 
     
136. if ((!isset($_POST['url'])) && (!isset($_GET['url']))) { echo '<form action="" method="post"><input name="url" type="text"><input type="submit" name="Submit" value="Get Pagerank"></form>'; }
     
137. if (isset($_REQUEST['url'])) { echo pagerank($_REQUEST['url']); }
     
138. ?>

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