FileSystem API Introduction
Introduction
The Filesystem API, added in WordPress 2.6, was originally created for WordPress’ own automatic updates feature. The Filesystem API abstracts out the functionality needed for reading and writing local files to the filesystem to be done securely, on a variety of host types.
It does this through the WP_Filesystem_Base class, and several subclasses which implement different ways of connecting to the local filesystem, depending on individual host support.
