code: public function load_options() {
  
  		$options = get_option( self::OPTION_KEY, '' );
  
  		if ( ! is_array( $options ) ) {
  			$options = self::$default_options;
  			update_option( self::OPTION_KEY, $options );
  		} else {
  			foreach ( self::$default_options as $key => $value ) {
  				if ( ! isset( $options[ $key ] ) )
  					$options[ $key ] = $value;
  			}
  		}
  
  		$this->options = $options;
  	}
docs: load options and set defaults if necessary
  
  @return void