View Full Version : Dynamic Image Rotator

02-07-2008, 05:26 PM
I've gotten this script to work. Basically all I have to do is put this script in the folder with all the pictures I want to use and link to that as an image and the picture will rotate every time you refresh the page.
I have a link here with it working. http://daisyphotography.com/picturerotate.php
however, I want to know if I can add something to make it automatically change every 7 seconds or so instead of the image just changing when you refresh the page.
Kristy :smile:



Version 2.2 - December 4, 2003
Copyright (c) 2002-2003 Dan P. Benjamin, Automatic, Ltd.
All Rights Reserved.



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.

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 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

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!

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['jpg'] = 'image/jpeg';
$extList['jpeg'] = 'image/jpeg';
$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;

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);
} 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);


02-07-2008, 05:55 PM
No you would have to find a different script for that. This one is for selecting a random image every time the page loads. Have a look at dynamicdrive.com, I remember seeing some image slideshows over there.

02-07-2008, 06:03 PM
I had found this one http://www.dynamicdrive.com/dynamicindex14/image4.htm
but I want it to pull pictures from a folder and not have to hard code it to be a specific image, can this work that way?

03-02-2008, 04:35 PM
Only if you're able to modify it.
You either have to settle with a canned script, or make your own.