Files: wp-admin/includes/class-wp-filesystem-base.php

Deletes a file or directory.

Checks if a file or directory exists.

Checks if resource is a file.

Checks if resource is a directory.

Checks if a file is readable.

Checks if a file or directory is writable.

Reads entire file into an array.

Gets the file’s last access time.

Writes a string to a file.

Gets the file modification time.

Gets the current working directory.

Gets the file size (in bytes).

Changes current directory.

Sets the access and modification times of a file.

Changes the file group.