How to write a PHP coding to list out all files and directories as links to them?

This is somewhat similar to some index pages. When new file or folder is added to the directory, HTML page should display the newly created file/folder together with previous ones after it is being refreshed. (prefer in alphabatical order)

How to achieve this sort of functionality in PHP? Please provide sample coding as well.

Reading $dir content

PHP Code:

$dir = ".";
if(is_dir($dir)) {
    if($dir_handle = opendir($dir)) {
        while($filename = readdir($dir_handle)) {
            echo "filename: {$filename}<br />";
        }
        closedir($dir_handle);
    }
} 


if you like to learn more about this thn go to w3schools.com/php/default.asp this will help you lot about this.