/ intval($row['folder_id']), 'folder_name' => nullable_htmlentities($row['folder_name']), 'parent_folder' => intval($row['parent_folder']), 'children' => array() ); } // Build the folder hierarchy foreach ($folders as $id => &$folder) { if ($folder['parent_folder'] != 0 && isset($folders[$folder['parent_folder']])) { $folders[$folder['parent_folder']]['children'][] = &$folder; } } unset($folder); // Break the reference // Prepare a list of root folders $root_folders = array(); foreach ($folders as $id => $folder) { if ($folder['parent_folder'] == 0) { $root_folders[] = $folder; } } // Display the folder options iteratively $stack = array(); foreach (array_reverse($root_folders) as $folder) { $stack[] = array('folder' => $folder, 'level' => 0); } while (!empty($stack)) { $node = array_pop($stack); $folder = $node['folder']; $level = $node['level']; // Indentation for subfolders $indentation = str_repeat(' ', $level * 4); // Check if this folder is selected $selected = ''; if ($folder['folder_id'] == $get_folder_id) { $selected = 'selected'; } echo "$indentation{$folder['folder_name']}"; // Add children to the stack if (!empty($folder['children'])) { foreach (array_reverse($folder['children']) as $child_folder) { $stack[] = array('folder' => $child_folder, 'level' => $level + 1); } } } ?>