[Christos]

Lösning hittad!

För de intresserade:

The code on this page displays an image selected at random using PHP. The list of images for this example comes from a directory listing. You could also select an image from an array of images from other sources, such as a database query, or a static list of images you provide.

The code for this example:
<?php
function getRandomFromArray($ar) {
  mt_srand( (double)microtime() * 1000000 );
  $num = array_rand($ar);
  return $ar[$num];
}

function getImagesFromDir($path) {
  $images = array();
  if ( $img_dir = @opendir($path) ) {
    while ( false !== ($img_file = readdir($img_dir)) ) {
      // checks for gif, jpg, png
      if ( preg_match("/(\.gif|\.jpg|\.png)$/", $img_file) ) {
        $images[] = $img_file;
      }
    }
    closedir($img_dir);
  }
  return $images;
}

$root = '';
// If images not in sub directory of current directory specify root 
//$root = $_SERVER['DOCUMENT_ROOT'];

$path = 'images/';

// Obtain list of images from directory 
$imgList = getImagesFromDir($root . $path);

$img = getRandomFromArray($imgList);

?>

Place the following where you wish the random image to appear:
<img src="<?php echo $path . $img ?>" alt="" />

Källa: http://www.dyn-web.com/code/rotate_i...om_img_php.php