试试这个:

// Use the class name instead of a globalized $this
remove_action( 'woocommerce_before_cart', array( 'WC_Points_Rewards_Cart_Checkout', 'render_redeem_points_message' ), 16 );

由于 $this 是它所在类的内部引用，因此将其全球化可能不是一件好事.

As $this is an internal referrer to the class it is used in, globalizing it may not be a good thing.

该插件是否允许您使用自己的类来扩展类并改为使用它?

Does the plugin allow you to extend the class with your own and use it instead?