Empty Woocommerce Cart before adding new item

If you happen to only wants to allow 1 item in your cart and remove all other cart item before adding one, this article might be your saver. Apparently there are a few article that uses a hook call 'woocommerce_add_to_cart' where it 'should' remove the item before adding it. But it doesn't work for newer version of woocommerce. However, there is another hook call 'woocommerce_add_to_cart_validation'. Therefore, if you would like to remove an item before adding a new item into your cart in Woocommerce, you should do something like this.

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