<?php
	set_time_limit(5);
 
	$i = 6;		// Количество итераций
	$xy = 1500;	// Размер стороны картинки
 
	$img = imagecreatetruecolor($xy, $xy);
 
	$black = imagecolorallocate($img, 0, 0, 0);
	$white = imagecolorallocate($img, 255, 255, 255);
 
	$cycle = 0;
	drawCarpet(0, 0, $xy, $xy, $i);
	function drawCarpet($a, $b, $c, $d, $n) {
		global $img, $white, $cycle;
		$cycle++;
 
		if($n <= 0) return;
 
		$a1 = 2 * $a / 3 + $c / 3;
		$c1 = $a / 3 + 2 * $c / 3;
		$b1 = 2 * $b / 3 + $d / 3;
		$d1 = $b / 3 + 2 * $d / 3;
 
		imagefilledrectangle($img, $a1, $b1, $c1, $d1, $white);
 
		drawCarpet($a, $b, $a1, $b1, $n - 1);
		drawCarpet($a1, $b, $c1, $b1, $n - 1);
		drawCarpet($c1, $b, $c, $b1, $n - 1);
 
		drawCarpet($a, $b1, $a1, $d1, $n - 1);
		drawCarpet($c1, $b1, $c, $d1, $n - 1);
 
		drawCarpet($a, $d1, $a1, $d, $n - 1);
		drawCarpet($a1, $d1, $c1, $d, $n - 1);
		drawCarpet($c1, $d1, $c, $d, $n - 1);
	}
 
	imagefilledrectangle($img, 0, 0, (strlen($cycle) * 9) , 16, $white);
	imagestring($img,21,0,0,$cycle,$black);
 
	header('Content-Type: image/png');
	imagepng($img);
?>