Google page rank checker

I got the following free script in a site. How to call the URL?.

<?php
	
	
	$check=strtolower($_GET['check']);
	if(preg_match('#^([a-z0-9_\-\.])+(\.([a-z0-9])+)+$#',$check))
	{function StrToNum($Str, $Check, $Magic) {
	$Int32Unit = 4294967296;
	$length = strlen($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;
	}

	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);
	}

		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 getch($url) { return CheckHash(HashURL($url)); }

	function pr($url)
	{
	$googlehost='toolbarqueries.google.com';
	$ch = getch($url);
	if ($ch)
	{
	$googleurl='http://'.$googlehost.'/tbr?client=navclient-auto&ch='.$ch.'&features=Rank&q=info:'.$url;
	$ch=curl_init();
	curl_setopt($ch, CURLOPT_URL, $googleurl);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_TIMEOUT, 5);
	$data = curl_exec($ch);
	curl_close($ch);
	if(!substr_count($data, "Rank_"))
	return ('n/a');
	else
	{
	$pos = strpos($data, "Rank_");
	$pr=substr($data, $pos + 9);
	$pr=trim($pr);
	$pr=str_replace("\n",'',$pr);
	return $pr;
	}
	}
	}
	echo '<img src="images-pr/pr_'.pr($check).'.gif" ><br><br><br><br>';
	
	}
	else{
	echo'Please check the existence of a website address!<br>';
	}




?>

PHP:

 

I got it. I was little confused

 

I saved this file in pagerank folder as check.php

and browse this URL to get Page rank

http://localhost/page/check.php?check=google.com