dir() 

is_dir()

<?php

#This script has been developped by Francesco D'Alesio [francesco@piuchegratis.com]
#Please feel free to contact me for any reason

#All you have to do is to change this two variables. Remember to use the absolute path for the first variable, starting with a slash

$absolute = "/templatesiso/miniiso/";
$url = "http://localhost/ph/templatesiso/miniiso";

#You my now add in the img html tag the url of this script
#<IMG SRC="http://yourdomain.com/whatever/imgrandom.php3">

# DO NOT CHANGE ANYTHING BELOW THIS LINE

$randir = is_dir("$absolute");

$num = 0;

while($read = readdir($randir))

{

$tmp = split("\.", $read, 2);

if ($tmp[1] == "jpg" || $tmp[1] == "JPG")

{

$imgsrc[] = $read;

$num++;

}

if ($tmp[1] == "gif" || $tmp[1] == "GIF")

{

$imgsrc[] = $read;

$num++;

}
}

srand((double)microtime()*1000000);

$imgrandom = rand(0,($num-1));



header("location: $url/$imgsrc[$imgrandom]");

?>

Warning: opendir( emplatesiso\miniiso) [function.opendir]: failed to open dir: No error in X:\home\localhost\www\ph\imgrandom.php3 on line 16

Warning: readdir(): supplied argument is not a valid Directory resource in X:\home\localhost\www\ph\imgrandom.php3 on line 20

Warning: Cannot modify header information - headers already sent by (output started at X:\home\localhost\www\ph\index.php:12) in X:\home\localhost\www\ph\imgrandom.php3 on line 53

  
$absolute = dirname(__FILE__) . "/templatesiso/miniiso/";
$url = "http://localhost/ph/templatesiso/miniiso";


if ($dir = @opendir($absolute))
{
  while ($file = readdir())
  {
    $tmp = split("\.", $file, 2);
    
    if ($tmp[1] == "jpg" || $tmp[1] == "JPG" || $tmp[1] == "gif" || $tmp[1] == "GIF")
      $imgsrc[] = $file;
  }

  $imgrandom = mt_rand(0,count($imgsrc));
  header("location: ". $url . "/" .$imgsrc[$imgrandom]);
  exit;
}
else
{
  die('Не удалось открыть папку: ' . $absolute);
}

Warning: Cannot modify header information - headers already sent by (output started at X:\home\localhost\www\ph\index.php:12) in X:\home\localhost\www\ph\imgrandom.php3 on line 24

<IMG SRC="http://localhost/ph/imgrandom.php3">

<?php include("imgrandom.php3"); ?>