| copy_dir() | Copies a directory from one location to another via the WordPress Filesystem Abstraction. |
| list_files() | Returns a listing of all files in the specified folder and all subdirectories up to 100 levels deep. The depth of the recursiveness can be controlled by the $levels param. |
| unzip_file() | Unzips a specified ZIP file to a location on the Filesystem via the WordPress Filesystem Abstraction. Assumes that WP_Filesystem() has already been called and set up. Does not extract a root-level __MACOSX directory, if present. |