PR值是google衡量网站的重要标准之一，根据google提供的结果获取pr值，如：
http://toolbarqueries.google.com.hk/tbr?client=navclient-auto&features=Rank:&q=info:phpddt.com&ch=8fabc62ea
/*
*功能:对URL进行编码
*参数说明:$web_url 网站URL，不包含"http://"
*/
function HashURL($url)
{
$SEED = "Mining PageRank is AGAINST GOOGLE'S TERMS OF SERVICE. Yes, I'm talking to you, scammer.";
$Result = 0x01020345;
for ($i=0; $i
$Result ^= ord($SEED{$i%87}) ^ ord($url{$i});
$Result = (($Result >> 23) & 0x1FF) | $Result }
return sprintf("8%x", $Result);
}
/*
*功能:根据google提供的pr查询接口获取pagerank
*参数说明:$domain 网站域名，不包含"http://"
*/
function pagerank($domain)
{
$StartURL = "http://toolbarqueries.google.com/tbr?client=navclient-auto&features=Rank:&q=info:";
$GoogleURL = $StartURL.$domain. '&ch='.HashURL($domain);
echo $GoogleURL.'
';
$fcontents = file_get_contents("$GoogleURL");
$pagerank = substr($fcontents,9);
if (!$pagerank) return "0";else return $pagerank;
}
echo pagerank("phpddt.com");
?>
