php获取网站的google pr值

<?php
/**
* php代码取得网站的PR值
* by www.jb200.com
*/
$googlehost="toolbarqueries.google.com";
$googleua="Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5";
echo getpr('http://www.jb200.com');
//convert a string to a 32-bit integer
function StrToNum($Str, $Check, $Magic) {
$Int32Unit = 4294967296; // 2^32
$length = strlen($Str);
for ($i = 0; $i < $length; $i++) {
$Check *= $Magic;
//If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31),
// the result of converting to integer is undefined
// refer to http://www.php.net/manual/en/language.types.integer.php
if ($Check >= $Int32Unit) {
$Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
//if the check less than -2^31
$Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
}
$Check += ord($Str{$i});
}
return $Check;
}
//genearate a hash for a url
function HashURL($String) {
$Check1 = StrToNum($String, 0&times;1505, 0&times;21);
$Check2 = StrToNum($String, 0, 0&times;1003F);
$Check1 >>= 2;
$Check1 = (($Check1 >> 4) & 0&times;3FFFFC0 ) | ($Check1 & 0&times;3F);
$Check1 = (($Check1 >> 4) & 0&times;3FFC00 ) | ($Check1 & 0&times;3FF);
$Check1 = (($Check1 >> 4) & 0&times;3C000 ) | ($Check1 & 0&times;3FFF);
$T1 = (((($Check1 & 0&times;3C0) << 4) | ($Check1 & 0&times;3C)) <<2 ) | ($Check2 & 0xF0F );
$T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0&times;3C00)) << 0xA) | ($Check2 & 0xF0F0000 );
return ($T1 | $T2);
}
//genearate a checksum for the hash string
function CheckHash($Hashnum) {
$CheckByte = 0;
$Flag = 0;
$HashStr = sprintf(&lsquo;%u&rsquo;, $Hashnum) ;
$length = strlen($HashStr);
for ($i = $length - 1; $i >= 0; $i &ndash;) {
$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.$HashStr;
}
//return the pagerank checksum hash
function getch($url) { return CheckHash(HashURL($url)); }
//return the pagerank figure
function getpr($url) {
global $googlehost,$googleua;
$pr = 0; // default return
$ch = getch($url);
$fp = fsockopen($googlehost, 80, $errno, $errstr, 30);
if ($fp) {
$out = "GET /search?client=navclient-auto&ch=$ch&features=Rank&q=info:$url HTTP/1.1rn";
//echo &ldquo;<pre>$out</pre>n&rdquo;; //debug only
$out .= &ldquo;User-Agent: $googleuarn&rdquo;;
$out .= &ldquo;Host: $googlehostrn&rdquo;;
$out .= &ldquo;Connection: Closernrn&rdquo;;
fwrite($fp, $out);
//$pagerank = substr(fgets($fp, 128), 4); //debug only
//echo $pagerank; //debug only
while (!feof($fp)) {
$data = fgets($fp, 128);
//echo $data;
$pos = strpos($data, &ldquo;Rank_&rdquo;);
if($pos === false){} else{
$pr=substr($data, $pos + 9);
$pr=trim($pr);
$pr=str_replace(&ldquo;n&rdquo;,&rdquo;,$pr);
return $pr;
}
}
//else { echo &ldquo;$errstr ($errno) n&rdquo;; } //debug only
fclose($fp);
}
return $pr;
}
?>