<?php

function StrToNum($Str, $Check, $Magic)
{
	$Int32Unit = 4294967296; // 2^32
	$length = strlen($Str);
	for ($i = 0; $i < $length; $i++)
	{
		$Check *= $Magic;
		if ($Check >= $Int32Unit)
		{
			$Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
			$Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
		}
		$Check += ord($Str{$i});
	}
return $Check;
}

/*
* Generate a hash for a url
*/
function HashURL($String)
{
	$Check1 = StrToNum($String, 0x1505, 0x21);
	$Check2 = StrToNum($String, 0, 0x1003F);

	$Check1 >>= 2;
	$Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);
	$Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);
	$Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF);

	$T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );
	$T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000 );

	return ($T1 | $T2);
}

/*
* generate a checksum for the hash string
*/
function CheckHash($Hashnum)
{
	$CheckByte = 0;
	$Flag = 0;

	$HashStr = sprintf('%u', $Hashnum) ;
	$length = strlen($HashStr);

	for ($i = $length - 1; $i >= 0; $i --)
	{
		$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;
}


function getpagerank($url)
{
	$query="http://toolbarqueries.google.com/search?client=navclient-auto&ch=".CheckHash(HashURL($url)). "&features=Rank&q=info:".$url."&num=100&filter=0";
	$data=file_get_contents($query);
	$pos = strpos($data, "Rank_");
	if($pos === false)
	{
	}
	else
	{
		$pagerank = substr($data, $pos + 9);
		return $pagerank;
	}
}


if(isset($_GET['url']))
{
	echo getpagerank($_GET['url']);
}

?>