image.php

<?php
$def_img_url="wolf-grass.jpg";
//default image to redirect to if no images exist in random dir


//read folder
$folder=opendir(getcwd());

while ($file = readdir($folder)){
        $ext=strtolower(substr(trim($file),-4));
        if ($ext==".jpg"||$ext==".gif"||$ext=="jpeg"||$ext==".png") {
                $imgs[]=$file;
        }
}

closedir($folder);

if (is_array($imgs)){
	srand((double)microtime()*1000000);
	
	do {
		$ofile = $imgs[rand(0, count($imgs)-1)];
	} while($ofile == $_SERVER['HTTP_ETAG']);
	
	$fp = fopen($ofile, "r");
	$size = getimagesize($ofile);
	header('ETag: ' . $ofile);
	header('Content-type: ' . $size['mime']);
	header("Content-Length: " . filesize($ofile));
	fpassthru($fp);
}else{
	header ("location: $def_img_url");
}
?>