Automatic Image Randomization/Rotation Using PHP

Ok here you go, This script simply takes your images inside a chosen folder and then loads a random picture inside that folder.
If you have any questions just Holla at me!

[cc lang=”php”]

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

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, smoke a cig or
do your thang.

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);



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I’m a bilingual Network Engineer. I have over 20 Years of Professional experience in Computer Science & Information Technology. I currently own and operate Web Semantics ( in Vancouver, Washington. I provide bilingual (English & Spanish) enterprise-level IT support to small and medium-sized businesses across the West Coast. *** Soy un ingeniero de redes bilingüe. Tengo más de 20 años de experiencia profesional en ciencias de la computación y tecnología de la información. Actualmente poseo y opero Web Semantics ( en Vancouver, Washington. Proporciono soporte de IT/Informática bilingüe (inglés y español) a nivel empresarial a pequeñas y medianas empresas en toda la costa oeste.

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