下面是本人搜集整理的一个利用PHP获取网站的google PR值的代码的方法，特贡献出来分享一下，完整代码如下：

<?php
$url='php.hhsy.cc';
define('G_PR_GET_TYPE_FILE', 1);
define('G_PR_GET_TYPE_SOCKET', 2);

echo getGooglePR($url);//获取http://php.hhsy.cc的PR值

function getGooglePR($_url,$gettype=G_PR_GET_TYPE_SOCKET){
	$url='info:'.$_url;
	$ch=GCH(strord($url));
	$ch=NewGCH($ch);
	$url=str_replace("_","%5F",'info:'.urlencode($_url));
	$googlePRUrl="http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=6".$ch."&ie=UTF-8&oe=UTF-8&features=Rank&q=".$url;
	$pr_str=retrieveURLContent($googlePRUrl,$gettype);
	return substr($pr_str,strrpos($pr_str, ":")+1);
}
function zeroFill($a, $b){
	$z=hexdec('8'.implode('',array_fill(0,PHP_INT_SIZE*2-1,'0')));
	if($z&$a){
	$a=($a>>1);
	$a &=(~$z);
	$a |=hexdec('4'.implode('',array_fill(0,PHP_INT_SIZE*2-1,'0')));
	$a=($a>>($b-1));
	}else{
	$a=($a>>$b);
	}
	return $a;
}
function trunkbitForce32bit($n){
	if(PHP_INT_SIZE<=4){
		settype($n,'float');
		if($n<0){
			$n+=4294967296;
		}
		return $n;
	}else{
		$clearbit='';
		for($i=0;$i<PHP_INT_SIZE-4;$i++){
			$clearbit.='00';
		}
		for($i=0;$i<4;$i++){
			$clearbit.='ff';
		}
		return ($n&hexdec($clearbit));
	}
}
function bigxor($m,$n){
	return $m ^ $n;
}
function mix($a,$b,$c){
	$a=trunkbitForce32bit($a);
	$b=trunkbitForce32bit($b);
	$c=trunkbitForce32bit($c);
	$a-=$b;
	$a=trunkbitForce32bit($a);
	$a-=$c;
	$a=trunkbitForce32bit($a);
	$a=bigxor($a,(zeroFill($c,13)));
	$a=trunkbitForce32bit($a);
	$b-=$c;
	$b=trunkbitForce32bit($b);
	$b-=$a;
	$b=trunkbitForce32bit($b);
	$b=bigxor($b,trunkbitForce32bit($a<<8));
	$b=trunkbitForce32bit($b);
	$c-=$a;
	$c=trunkbitForce32bit($c);
	$c-=$b;
	$c=trunkbitForce32bit($c);
	$c=bigxor($c,(zeroFill($b,13)));
	$c=trunkbitForce32bit($c);
	$a-=$b;
	$a=trunkbitForce32bit($a);
	$a-=$c;
	$a=trunkbitForce32bit($a);
	$a=bigxor($a,(zeroFill($c,12)));
	$a=trunkbitForce32bit($a);
	$b-=$c;
	$b=trunkbitForce32bit($b);
	$b-=$a;
	$b=trunkbitForce32bit($b);
	$b=bigxor($b,trunkbitForce32bit($a<<16));
	$c-=$a;
	$c=trunkbitForce32bit($c);
	$c-=$b;
	$c=trunkbitForce32bit($c);
	$c=bigxor($c,(zeroFill($b,5)));
	$c=trunkbitForce32bit($c);
	$a-=$b;
	$a=trunkbitForce32bit($a);
	$a-=$c;
	$a=trunkbitForce32bit($a);
	$a=bigxor($a,(zeroFill($c,3)));
	$a=trunkbitForce32bit($a);
	$b-=$c;
	$b=trunkbitForce32bit($b);
	$b-=$a;
	$b=trunkbitForce32bit($b);
	$b=bigxor($b,trunkbitForce32bit($a<<10));
	$c-=$a;
	$c=trunkbitForce32bit($c);
	$c-=$b;
	$c=trunkbitForce32bit($c);
	$c=bigxor($c,(zeroFill($b,15)));
	$c=trunkbitForce32bit($c);
	return array($a,$b,$c);
}
function NewGCH($ch){
	$ch=(trunkbitForce32bit(($ch/7 )<<2)|((myfmod($ch,13))&7));
	$prbuf=array();
	$prbuf[0]=$ch;
	for($i=1;$i<20;$i++){
		$prbuf[$i]=$prbuf[$i-1] - 9;
	}
	$ch=GCH(c32to8bit($prbuf));
	return $ch;
}
function myfmod($x,$y){
	$i=floor($x/$y );
	return ($x - $i * $y );
}
function c32to8bit($arr32){
	$arr8=array();
	for($i=0;$i<count($arr32);$i++){
		for($bitOrder=$i * 4;$bitOrder<=$i * 4 + 3;$bitOrder++){
			$arr8[$bitOrder]=$arr32[$i]&255;
			$arr32[$i]=zeroFill($arr32[$i], 8 );
		}
	}
	return $arr8;
}
function GCH($url, $length=null){
	if(is_null($length)){
		$length=sizeof($url);
	}
	$init=0xE6359A60;
	$a=0x9E3779B9;
	$b=0x9E3779B9;
	$c=0xE6359A60;
	$k=0;
	$len=$length;
	$mixo=array();
	while($len >=12){
		$a+=($url[$k+0] +trunkbitForce32bit($url[$k+1]<<8)+trunkbitForce32bit($url[$k+2]<<16)+trunkbitForce32bit($url[$k+3]<<24));
		$b+=($url[$k+4] +trunkbitForce32bit($url[$k+5]<<8)
		+trunkbitForce32bit($url[$k+6]<<16)
		+trunkbitForce32bit($url[$k+7]<<24));
		$c+=($url[$k+8] +trunkbitForce32bit($url[$k+9]<<8)
		+trunkbitForce32bit($url[$k+10]<<16)
		+trunkbitForce32bit($url[$k+11]<<24));
		$mixo=mix($a,$b,$c);
		$a=$mixo[0];$b=$mixo[1];$c=$mixo[2];
		$k+=12;
		$len-=12;
	}
	$c+=$length;
	switch($len){
	case 11:
	$c+=trunkbitForce32bit($url[$k+10]<<24);
	case 10:
	$c+=trunkbitForce32bit($url[$k+9]<<16);
	case 9 :
	$c+=trunkbitForce32bit($url[$k+8]<<8);
	case 8 :
	$b+=trunkbitForce32bit($url[$k+7]<<24);
	case 7 :
	$b+=trunkbitForce32bit($url[$k+6]<<16);
	case 6 :
	$b+=trunkbitForce32bit($url[$k+5]<<8);
	case 5 :
	$b+=trunkbitForce32bit($url[$k+4]);
	case 4 :
	$a+=trunkbitForce32bit($url[$k+3]<<24);
	case 3 :
	$a+=trunkbitForce32bit($url[$k+2]<<16);
	case 2 :
	$a+=trunkbitForce32bit($url[$k+1]<<8);
	case 1 :
	$a+=trunkbitForce32bit($url[$k+0]);
	}
	$mixo=mix($a, $b, $c );
	$mixo[2]=trunkbitForce32bit($mixo[2]);
	if($mixo[2]<0){
	return (hexdec('1'.implode('',array_fill(0,PHP_INT_SIZE*2,'0'))) + $mixo[2] );
	}else{
	return $mixo[2];
	}
}
function strord($string){
	for($i=0;$i<strlen($string);$i++){
		$result[$i]=ord($string{$i});
	}
	return $result;
}
function retrieveURLContent($url,$gettype){
	switch($gettype){
		case G_PR_GET_TYPE_FILE:
			return retrieveURLContentByFile($url);
		break;
		default:
			return retrieveURLContentBySocket($url);
		break;
	}
}
function retrieveURLContentByFile($url){
	$fd=@fopen($url,"r");
	if(!$fd){
		return false;
	}
	$result="";
	while($buffer=fgets($fd, 4096)){
		$result.=$buffer;
	}
	fclose($fd);
	return $result;
}
function retrieveURLContentBySocket($url,$host="",$port=80,$timeout=30){
	if($host ==""){
		if(!($pos=strpos($url,'://'))){return false;}
		$host=substr($url,
		$pos+3,
		strpos($url,'/',$pos+3) - $pos - 3);
		$uri=substr($url,strpos($url,'/',$pos+3));
	}else{
		$uri=$url;
	}
	$request="GET ".$uri." HTTP/1.0\r\n"."Host: ".$host."\r\n"."Accept: */*\r\n"."User-Agent: ZealGet\r\n"."\r\n";
	$sHnd=@fsockopen ($host, $port, $errno, $errstr, $timeout);
	if(!$sHnd){
		return false;
	}
	@fputs($sHnd, $request);
	$result='';
	while (!feof($sHnd)){
		$result.=fgets($sHnd,4096);
	}
	fclose($sHnd);
	$headerend=strpos($result,"\r\n\r\n");
	if(is_bool($headerend)){
		return $result;
	}else{
		return substr($result,$headerend+4);
	}
}