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/**
 * CLEAR CART
 * Checks for clear-cart from get param to clear the cart
 */
add_action( 'init', 'woocommerce_clear_cart_url' );
function woocommerce_clear_cart_url() {
    if ( isset( $_GET['clear-cart'] ) ) {
        global $woocommerce;
        $woocommerce->cart->empty_cart();
    }
}