Deletes all files and folders and subfolders in given folder

function deltree($f) {
	if (@is_dir($f)) {
		foreach(glob($f.'/*') as $sf) {
			if (@is_dir($sf) && !is_link($sf)) {
				@deltree($sf);
			} else {
				@unlink($sf);
			}
		}
	}
	if (@is_dir($f)) rmdir($f);
	return true;
}