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

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.

Writes a string to a file.

Gets the current working directory.

Changes current directory.

Changes filesystem permissions.

Gets the file owner.

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

Gets the file’s group.

Copies a file.

Moves a file.