PHP - Listing all directories and sub-directories recursively in drop down menu [duplicate]

Answer 1

You can use a recursive glob implementation like in this function:

function rglob($pattern='*', $path='', $flags = 0) {
$paths=glob($path.'*', GLOB_MARK|GLOB_ONLYDIR|GLOB_NOSORT);
$files=glob($path.$pattern, $flags);
foreach ($paths as $path) {
  $files=array_merge($files,rglob($pattern, $path, $flags));
}
return $files;
}