<?php
/*
AUTOMATIC IMAGE ROTATOR Version 2.2 - December 4, 2003 Copyright (c) 2002-2003 Dan P. Benjamin, Automatic, Ltd. All Rights Reserved.
http://www.hiveware.com/imagerotator.php http://www.automaticlabs.com/ DISCLAIMER Automatic, Ltd. makes no representations or warranties about the suitability of the software, either express or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, or non-infringement. Dan P. Benjamin and Automatic, Ltd. shall not be liable for any damages suffered by licensee as a result of using, modifying or distributing this software or its derivatives. ABOUT This PHP script will randomly select an image file from a folder of images on your webserver. You can then link to it as you would any standard image file and you'll see a random image each time you reload. When you want to add or remove images from the rotation-pool, just add or remove them from the image rotation folder.
VERSION CHANGES Version 1.0 - Release version Version 1.5 - Tweaked a few boring bugs Version 2.0 - Complete rewrite from the ground-up - Made it clearer where to make modifications - Made it easier to specify/change the rotation-folder - Made it easier to specify/change supported image types - Wrote better instructions and info (you're them reading now) - Significant speed improvements - More error checking - Cleaner code (albeit more PHP-specific) - Better/faster random number generation and file-type parsing - Added a feature where the image to display can be specified - Added a cool feature where, if an error occurs (such as no images being found in the specified folder) *and* you're lucky enough to have the GD libraries compiled into PHP on your webserver, we generate a replacement "error image" on the fly. Version 2.1 - Updated a potential security flaw when value-matching filenames
Version 2.2 - Updated a few more potential security issues - Optimized the code a bit. - Expanded the doc for adding new mime/image types.
Thanks to faithful ALA reader Justin Greer for lots of good tips and solid code contribution!
INSTRUCTIONS 1. Modify the $folder setting in the configuration section below. 2. Add image types if needed (most users can ignore that part). 3. Upload this file (rotate.php) to your webserver. I recommend uploading it to the same folder as your images. 4. Link to the file as you would any normal image file, like this:
<img src="http://example.com/rotate.php">
5. You can also specify the image to display like this:
<img src="http://example.com/rotate.php?img=gorilla.jpg"> This would specify that an image named "gorilla.jpg" located in the image-rotation folder should be displayed. That's it, you're done.
*/
/* ------------------------- CONFIGURATION -----------------------
Set $folder to the full path to the location of your images. For example: $folder = '/user/me/example.com/images/'; If the rotate.php file will be in the same folder as your images then you should leave it set to $folder = '.';
*/
$folder = '.';
/*
Most users can safely ignore this part. If you're a programmer, keep reading, if not, you're done. Go get some coffee.
If you'd like to enable additional image types other than gif, jpg, and png, add a duplicate line to the section below for the new image type. Add the new file-type, single-quoted, inside brackets. Add the mime-type to be sent to the browser, also single-quoted, after the equal sign. For example: PDF Files:
$extList['pdf'] = 'application/pdf'; CSS Files:
$extList['css'] = 'text/css';
You can even serve up random HTML files:
$extList['html'] = 'text/html'; $extList['htm'] = 'text/html';
Just be sure your mime-type definition is correct!
*/
$extList = array();
$extList['gif'] = 'image/gif';
$extList['png'] = 'image/png';
// You don't need to edit anything after this point.
// --------------------- END CONFIGURATION -----------------------
$img = null;
if (substr($folder,-1) != '/') { $folder = $folder.'/';}
if (isset($_GET['img'])) { $imageInfo = pathinfo($_GET['img']); if ( isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) && file_exists( $folder.$imageInfo['basename'] ) ) { $img = $folder.$imageInfo['basename']; }} else { $fileList = array(); $handle = opendir($folder); 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 = $folder.$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, "ERROR CTM!", $text_color); imagepng ($im); imagedestroy($im); }}
?>
