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GooglePR值的PHP实现代码

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互联网集市收集整理的这篇技术教程文章主要介绍了GooglePR值的PHP实现代码，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3751字，纯文字阅读大概需要6分钟。

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

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