<?

//landing pages filenames, theses will be rotated between eachother
//theses landing pages must be in the same DIRECTORY as this file
//you can add as many landing pages here as you like
$landingpage[0] = 'landingpage1.php';
$landingpage[1] = 'landingpage2.php';
$landingpage[2] = 'landingpage3.php';
$lpcount = count($landingpage);

//this is the text file, which will be stored in the same directory as this file,
//count.txt needs to be CHMOD to 777, full privlledges, to read and write to it.
$myFile = "count.txt";

// check cookie for security
// loading a php script based on a cookie is scary without checking it
$usecookie = false;
if ($_COOKIE['landing']) {
	for ($i = 0; $i < $lpcount; $i++) {
		if ($_COOKIE['landing'] == $landingpage[$i]) {
			$usecookie = true;
			$lpNumber = $i;
		}
	}
}

if ($usecookie === false) {  // use myFile
	//open the txt file
	$fh = @fopen($myFile, 'r');
	$lpNumber = @fread($fh, 5);
	@fclose($fh);

	//see which landing page is next in line to be shown.
	if ($lpNumber >= count($landingpage)) {
		$lpNumber = 1;
	} else {
		$lpNumber = $lpNumber + 1;
	}

	//write to the txt file.
	$fh = fopen($myFile, 'w') or die("can't open file");
	$stringData = $lpNumber . "\n";
	fwrite($fh, $stringData);
	fclose($fh);

	// set the cookie
	$expire = time() + 60*60*24*7;
	setcookie("landing", $landingpage[$lpNumber], $expire);
}

//include the landing page
include_once($landingpage[$lpNumber]);

//terminate script
die();

?>