> For the complete documentation index, see [llms.txt](https://ninjateam.gitbook.io/filebird/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ninjateam.gitbook.io/filebird/integrations/developer-zone/functions.md).

# Functions

**Get Folder Detail**

```
<?php
use FileBird\Model\Folder as FolderModel;
$folder_id = 1;
$folder = FolderModel::findById( $folder_id, 'id, name, parent' );

```

**Get Folders**

```
<?php
use FileBird\Classes\Tree;
$folders = Tree::getFolders( null );

```

**Create New Folder**

```
<?php
use FileBird\Model\Folder as FolderModel;
$name = 'Cat';
$parent_id = 0;
FolderModel::newOrGet( $name, $parent_id );

```

**Get Attachment Ids by Folder Id**

```
<?php
use FileBird\Classes\Helpers as Helpers;
$folder_id = 1;
$ids = Helpers::getAttachmentIdsByFolderId( $folder_id );

```

**Add attachment(s) to folder**

```
<?php
use FileBird\Model\Folder as FolderModel;
$post_ids = [ 1, 2, 3 ];
$folder = 1;
FolderModel::setFoldersForPosts( $post_ids, $folder );

```