Randomly rotates images for display in current directory.

rotate.php

<?php

$extList = array();
$extList['gif'] = 'image/gif';
$extList['jpg'] = 'image/jpg';
$extList['jpeg'] = 'image/jpeg';
$extList['png'] = 'image/png';

$fileList = array();
$handle = opendir("./");
while(false !== ($file = readdir($handle))) {
    $file_info = pathinfo($file);
  if(isset($extList[strtolower($file_info['extension'])])) {
		$fileList[] = $file;
	}
}
closedir($handle);

if(count($fileList) > 0) {
	$imageNumber = time() % count($fileList);
	$img = $fileList[$imageNumber];
}

if($img != null) {
	$imageInfo = pathinfo($img);
	$contentType = 'Content-type: ' . $extList[$imageInfo['extension']];
	header($contentType);
	readfile($img);
} else {
	if(function_exists('imagecreate')) {
		header("Content-type: image/png");
		$im = @imagecreate(100, 100) or die("Cannot initialize new GD image stream");
		$background_color = imagecolorallocate($im, 255, 255, 255);
		$text_color = imagecolorallocate($im, 0, 0, 0);
		imagestring($im, 2, 5, 5, "IMAGE ERROR", $text_color);
		imagepng($im);
		imagedestroy($im);
	}
}

?>