<?php
function zeroFill($a, $b) {
	$z = hexdec(80000000);
	if ($z & $a) {
		$a = ($a>>1);
		$a &= (~$z);
		$a |= 0x40000000;
		$a = ($a>>($b-1));
	} else {
		$a = ($a>>$b);
	}
	return $a;
}
function mix($a,$b,$c) {
	$a -= $b; $a -= $c; $a ^= (zeroFill($c,13));
	$b -= $c; $b -= $a; $b ^= ($a<<8);
	$c -= $a; $c -= $b; $c ^= (zeroFill($b,13));
	$a -= $b; $a -= $c; $a ^= (zeroFill($c,12));
	$b -= $c; $b -= $a; $b ^= ($a<<16);
	$c -= $a; $c -= $b; $c ^= (zeroFill($b,5));
	$a -= $b; $a -= $c; $a ^= (zeroFill($c,3)); 
	$b -= $c; $b -= $a; $b ^= ($a<<10);
	$c -= $a; $c -= $b; $c ^= (zeroFill($b,15));
	return array($a,$b,$c);
}
function GoogleCH($url, $length=null, $init=0xE6359A60) {
	if(is_null($length)) {
		$length = sizeof($url);
	}
	$a = $b = 0x9E3779B9;
	$c = $init;
	$k = 0;
	$len = $length;
	while($len >= 12) {
		$a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
		$b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
		$c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
		$mix = mix($a,$b,$c);
		$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
		$k += 12;
		$len -= 12;
	}
	$c += $length;
	switch($len) {
		case 11: $c+=($url[$k+10]<<24);
		case 10: $c+=($url[$k+9]<<16);
		case 9 : $c+=($url[$k+8]<<8);
		case 8 : $b+=($url[$k+7]<<24);
		case 7 : $b+=($url[$k+6]<<16);
		case 6 : $b+=($url[$k+5]<<8);
		case 5 : $b+=($url[$k+4]);
		case 4 : $a+=($url[$k+3]<<24);
		case 3 : $a+=($url[$k+2]<<16);
		case 2 : $a+=($url[$k+1]<<8);
		case 1 : $a+=($url[$k+0]);
	}
	$mix = mix($a,$b,$c);
	return $mix[2];
}
function strord($string) {
	for($i=0;$i<strlen($string);$i++) {
		$result[$i] = ord($string{$i});
	}
	return $result;
}
function get_pr($url) {
	$result=array("",-1);
	if(($url.""!="")&&($url.""!="http://")):
		if(substr(strtolower($url),0,7)!="http://"):
			$url="http://".$url;
		endif;
		$url="info:".$url;
		$checksum=GoogleCH(strord($url));
		$google_url=sprintf("http://www.google.com/search?client=navclient-auto&ch=6%u&features=Rank&q=".$url,$checksum); // url to get from google 
		$contents = file_get_contents($google_url);
		$p=explode(":",$contents);
		if(isset($p[2])):
			$result[1]=$p[2];
		endif;
	endif;
	return $result;
}
function getPR_url($url) {
	global $db;
	if(eregi('^http://www.',$url)) {
		$url_www = str_replace('http://www.','http://',$url);
	} else {
		$url_www = str_replace('http://','http://www.',$url);
	}
	$pr=get_pr($url);
	$output=$pr[0];
	$pagerank=$pr[1];
	sleep(1);
	$pr=get_pr($url_www);
	$output_www=$pr[0];
	$pagerank_www=$pr[1];
	if($pagerank<$pagerank_www) {
		$pagerank=$pagerank_www;
	}
	if($pagerank==-1) {
		$pagerank=0;
	}
	return intval($pagerank);
}
echo 'PR: '.getPR_url('http://antichat.ru/');
?>