[WordPress] Using a WordPress Hook for Updating Options

00-init.php

<?php

/**
 * Initializes the defined actions.
 */
public function init() {

  add_action(
    'update_option',
    array( $this, 'toggle_other_option' ),
    10, 3
  );
}

01-toggle_other_option.php

<?php

/**
 * If the given option_name is `user_is_disguised`, then toggles another option
 * in the database - `user_is_superman` - based on the specified values.
 *
 * @param string $option_name The name of the value being updated.
 * @param mixed  $old_value   The previous value of the option before updating it.
 * @param mixed  $new_value   The value of the option now that it's been updated.
 */
public function toggle_other_option( $option_name, $old_value, $new_value ) {
  
  // If 'user_is_disguised' is not being changed, then don't worry about it.
  if ( 0 !== strcasecmp( $option_name, 'user_is_disguised' ) ) {
   return; 
  }
  
  /* If 'user_is_disguised' is being set, then remove the Superman value; otherwise,
   * set it to true (but don't worry about autoloading it).
   */
  if ( '1' === $new_value ) {
    delete_option( 'user_is_superman' );
  } else {
    update_option( 'user_is_superman', true, false );
  }
}