Displaying Random Image in Your Page

Nov 4, 2008 | Tags: PHP, Image | del.icio.us del.icio.us | digg Digg

Displaying a random image in your page is cool & fun. It's also useful if you want to display random banners or such. Here it is:

Listing 1: random_img.php

  1. <?php
  2. /**
  3.  * random_img.php :
  4.  * This script selects a random image from a specified
  5.  * directory and outputs the image to browser.
  6.  */
  7.  
  8. /* output selected image to browser */
  9. function out2browser($filename)
  10. {
  11.     list($width, $height, $type) = getimagesize($filename);
  12.    
  13.     switch($type) {
  14.         case IMAGETYPE_PNG:
  15.             $img = imagecreatefrompng($filename);
  16.             header("Content-type: image/png");
  17.             imagepng($img);
  18.             break;
  19.         case IMAGETYPE_GIF:
  20.             $img = imagecreatefromgif($filename);
  21.             header("Content-type: image/gif");
  22.             imagegif($img);
  23.             break;
  24.         case IMAGETYPE_JPEG:
  25.             $img = imagecreatefromjpeg($filename);
  26.             header("Content-type: image/jpeg");
  27.             imagejpeg($img);
  28.             break;
  29.     }
  30. }
  31.  
  32. /* change to your images directory */
  33. $imgpath = "C:/www/img/avatar";
  34. $images  = array();
  35.  
  36. /* list images */
  37. $files = scandir($imgpath);
  38.  
  39. foreach($files as $file) {
  40.     /* select only gif, jpg and png images */
  41.     $ext = substr($file, -4);
  42.     if ($ext == '.gif' || $ext == '.jpg' || $ext == '.png') {
  43.         $images[] = $file;
  44.     }
  45. }
  46.  
  47. /* select random image */
  48. $val = rand(0, count($images) - 1);
  49. $img = $images[$val];
  50.  
  51. out2browser("$imgpath/$img");
  52. ?>

The script above will display a random image from the specified directory. Use the script above in your <img> tag like this:

<img src="random_img.php" border="0" alt="my random image" />

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2 Comments

Hillbilly Geek on Dec 27, 2008:

On Line 41, if you do this:
$ext = strtolower(substr($file, -4));
then it will handle both upper and lowercase filenames
Otherwise, this is one of the few scripts that gave me no problems, and seems to work well

Nash on Dec 28, 2008:

Thanks for your suggestion!

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