Options API (settings) (tag)
| add_network_option() | Add a new network option. |
| add_option() | Adds a new option. Does nothing if this option already exists. |
| delete_option() | Removes option by name. Prevents removal of protected WordPress options. |
| get_network_option() | Retrieve a network's option value based on the option name. |
| get_option() | Gets the value of the specified option by option name. |
| get_site_option() | Retrieve an option value for the current network based on name of option. |
| register_setting() | Registers a new option and a callback function to handle the option value when it is saved to the database. |
| update_option() | Update the value of an option that was already added. |
| update_site_option() | Update the value of an option that was already added for the current network. |