Retrieves user interface setting value based on setting name.

Registers default settings available in WordPress.

Registers a setting and its data.

Sets/updates the value of a site transient.

Sets/updates the value of a transient.

Adds or updates user interface setting.

Unregisters a setting.

Updates the value of a network option that was already added.

Updates the value of an option that was already added.

Updates the value of an option that was already added for the current network.