Rotating background images

Question Description

I’m studying for my Programming class and need an explanation.

Good day

I'm using a one page full background template with 3 images that rotate if you click on the buttons on the bottom of the page. I can/and want to remove these buttons, but i need help in rotating the images automatically? The template got JQUERY 1.6 with bgslidder. Any help will be appreciated.


Wessel Britz 

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Final Answer

Here are instructions on how to do it:

1.) Open up your favorite web page editor. (SOMETHING OTHER THAN A WORD PROCESSOR)

2.) Copy the below code, paste in a php format page.
Code: [Select]


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="">

5. You can also specify the image to display like this:

<img src="">

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/';
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);


3.) Save as rotate.php

4.) Upload to your ./<dir_to_smf>/Themes/<your_theme>/images/background
If you need to make a folder called background than make one inside of Themes/<your_theme/images

5.) Upload roate.php to the new folder called background inside of your theme. Choose background images you want to randomly rotate and put them in /background/ as well. It doesn't matter what the image files are called. The only requirement is they must be one of these image formats: gif, jpg, jpeg, png

6.) Inside wherever you want the images to rotate. Probably in a table. Use a code like below:
Code: [Select]
<table background="', $settings['images_url'], '/background/rotate.php">

It should now rotate through all images inside of the background as long as you link it to the php file. This should work, and I know the code I provided works because I use it on my site for different purposes.

To test the actual rotation of the images, just run this url directly in your browser.

keziaayako (17)
UT Austin

Return customer, been using sp for a good two years now.

Thanks as always for the good work!

Excellent job