<?php $imglist='';
     //$img_folder is the variable that holds the path to the banner images.
     // see that you dont forget about the "/" at the end
     $img_folder = "images/";
     mt_srand((double)microtime()*1000);
     //use the directory class
     $imgs = dir($img_folder);
     //read all files from the directory, checks if are images and ads them to a list (see below how to display flash banners)
     while ($file = $imgs->read()) {
      if (eregi("gif", $file) || eregi("jpg", $file) || eregi("png", $file))
      $imglist .= "$file ";
    } closedir($imgs->handle);
     //put all images into an array
    $imglist = explode(" ", $imglist); $no = sizeof($imglist)-2;
    //generate a random number between 0 and the number of images
    $random = mt_rand(0, $no); $image = $imglist[$random];
    //display image
    echo '<img class="img-responsive" src="'.$img_folder.$image.'" border=0>'; ?>