option_update_filter() WordPress Function

The option_update_filter() function is used to filter the new value of an option before it is updated. The function takes two arguments: the new value of the option and the old value of the option. The function can return three values: 1. The new value of the option, which will be stored in the database. 2. The old value of the option, which will not be changed. 3. null, which will cause the option to be deleted from the database.

option_update_filter( array $options ) #

function option_update_filter( $options ) {
	global $new_allowed_options;

	if ( is_array( $new_allowed_options ) ) {
		$options = add_allowed_options( $new_allowed_options, $options );
	}

	return $options;
}