It displays a hyperlinked list of all the files contained in a specified folder. A really simple way to have your own directory browser, just drop the file in the folder and it will show an index of all files in the directory on your webspace.
PHP Code:

/**
 * Change the path to your folder.
 *
 * This must be the full path from the root of your
 * web space. If you're not sure what it is, ask your host.
 *
 * Name this file index.php and place in the directory.
 */

    // Define the full path to your folder from root
    
$path "/home/user/public/foldername/";

    
// Open the folder
    
$dir_handle = @opendir($path) or die("Unable to open $path");

    
// Loop through the files
    
while ($file readdir($dir_handle)) {

    if(
$file == "." || $file == ".." || $file == "index.php" )

        continue;
        echo 
"$file
"
;

    }

    
// Close
    
closedir($dir_handle);
?>