get_dir_file_info($source_dir, $top_level_only)

get_filenames($source_dir[, $include_path = FALSE])

symbolic_permissions($perms)

get_mime_by_extension($filename)

octal_permissions($perms)

get_file_info($file[, $returned_values = array('name', 'server_path', 'size', 'date')])

write_file($path, $data[, $mode = 'wb'])

read_file($file)

delete_files($path[, $del_dir = FALSE[, $htdocs = FALSE]])