This filter is documented in wp-includes/option.php
pre_site_option_{$option}
Filters an existing network option before it is retrieved.
update_site_option
Updates the value of an option that was already added for the current network.
get_network_option
Retrieves a network’s option value based on the option name.
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delete_site_option
Removes a option by name for the current network.
add_site_option
Adds a new option for the current network.
get_site_option
Retrieve an option value for the current network based on name of option.
delete_all_user_settings
Deletes the user settings of the current user.
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wp_set_all_user_settings
Private. Sets all user interface settings.
get_all_user_settings
Retrieves all user interface settings.
delete_user_setting
Deletes user interface settings.
get_user_setting
Retrieves user interface setting value based on setting name.
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set_user_setting
Adds or updates user interface setting.
wp_user_settings
Saves and restores user interface settings stored in a cookie.
delete_expired_transients
Deletes all expired transients.