scandir to only show folders, not files

Question

I have a bit of PHP used to pulled a list of files from my image directory - it's used in a form to select where an uploaded image will be saved. Below is the code:

$files = array_map("htmlspecialchars", scandir("../images"));       

foreach ($files as $file) {
 $filelist .= sprintf('<option value="%s">%s</option>' . PHP_EOL, $file, $file );
}

It works fine but shows all files and folders in 'images', does someone know a way to modify this code so that it only shows folder names found in the 'images' folder, not any other files.

Thanks

Answer 1

The easiest and quickest will be glob with GLOB_ONLYDIR flag:

foreach(glob('../images/*', GLOB_ONLYDIR) as $dir) {
    $dirname = basename($dir);
}

Answer 2

Function is_dir() is the solution :

foreach ($files as $file) {

  if(is_dir($file) and $file != "." && $file != "..") $filelist .= sprintf('<option value="%s">%s</option>' . PHP_EOL, $file, $file );

}