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

Reads entire file into an array.

Writes a string to a file.

Gets the current working directory.

Changes current directory.

Changes the file group.

Changes filesystem permissions.

Checks if a file or directory is writable.

Gets the file’s last access time.

Gets the file modification time.

Gets the file size (in bytes).

Sets the access and modification times of a file.

Creates a directory.

Gets the file owner.

Deletes a directory.

Gets the permissions of the specified file or filepath in their octal format.