WordPress File wp-admin/includes/class-wp-filesystem-base.php

WP_Filesystem_Base::getnumchmodfromh()

Converts *nix-style file permissions to a octal number.

WP_Filesystem_Base::group()

Gets the file’s group.

WP_Filesystem_Base::is_binary()

Determines if the string provided contains binary characters.

WP_Filesystem_Base::is_dir()

Checks if resource is a directory.

WP_Filesystem_Base::is_file()

Checks if resource is a file.

WP_Filesystem_Base::is_readable()

Checks if a file is readable.

WP_Filesystem_Base::is_writable()

Checks if a file or directory is writable.

WP_Filesystem_Base::mkdir()

Creates a directory.

WP_Filesystem_Base::move()

Moves a file.

WP_Filesystem_Base::mtime()

Gets the file modification time.