PHP buton gösterimi

<?

$host = getenv('HTTP_REFERER');
	$url = 'info:' . $host;
			$checksum = checksum(strord($url));
			$url = "http://www.google.com/search?client=navclient-auto&ch=6".$checksum."&features=Rank&q=".$url;
			$data = getPage($url);
			preg_match('#Rank_[0-9]:[0-9]:([0-9]+){1,}#si', $data, $p);
			$value = ($p[1]) ? $p[1] : 0;
			$img = "primg/2/pr".$value.".gif";
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Content-type: image/gif");
@readfile($img);

			
			function getPage ($url) {
			if (function_exists('curl_init')) {
				$ch = curl_init($url);
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
				@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
				curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
				return curl_exec($ch);
			} else {
				return file_get_contents($url);
			}
		}
			
			
			function checksum ($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 $result;
		}
		function mix ($a, $b, $c) {
			$a -= $b; $a -= $c; to_int_32($a); $a = (int)($a ^ (zero_fill($c, 13)));
			$b -= $c; $b -= $a; to_int_32($b); $b = (int)($b ^ ($a << 8));
			$c -= $a; $c -= $b; to_int_32($c); $c = (int)($c ^ (zero_fill($b, 13)));
			$a -= $b; $a -= $c; to_int_32($a); $a = (int)($a ^ (zero_fill($c, 12)));
			$b -= $c; $b -= $a; to_int_32($b); $b = (int)($b ^ ($a << 16));
			$c -= $a; $c -= $b; to_int_32($c); $c = (int)($c ^ (zero_fill($b, 5)));
			$a -= $b; $a -= $c; to_int_32($a); $a = (int)($a ^ (zero_fill($c, 3)));
			$b -= $c; $b -= $a; to_int_32($b); $b = (int)($b ^ ($a << 10));
			$c -= $a; $c -= $b; to_int_32($c); $c = (int)($c ^ (zero_fill($b, 15)));
			return array($a,$b,$c);
		}
		
			function toInt ($string) {
			return preg_replace('#[^0-9]#si', '', $string);
		}
		
		function to_int_32 (&$x) {
			$z = hexdec(80000000);
			$y = (int) $x;
			if($y ==- $z && $x <- $z){
				$y = (int) ((-1) * $x);
				$y = (-1) * $y;
			}
			$x = $y;
		}
		
		function zero_fill ($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;
		}
		
?>