WooCommerce Add-to-Cart & Empty-Cart from URL

functions.php

<?php 

// empties the shopping cart
add_action( 'wp_loaded', 'custom_woocommerce_empty_cart_action', 20 );
function custom_woocommerce_empty_cart_action() {
	if ( isset( $_GET['empty-cart'] ) && 'yes' === esc_html( $_GET['empty-cart'] ) ) {
		WC()->cart->empty_cart();
	}
}

// add products to cart via the URL
add_action( 'wp_loaded', 'custom_woocommerce_add_multiple_to_cart_via_url', 25 );
function custom_woocommerce_add_multiple_to_cart_via_url() {
	if ( isset( $_GET['add-to-cart'] ) ) {
		$products = explode( ',', sanitize_text_field( $_GET['add-to-cart'] ) );

		foreach ( $products as $product_data ) {
			// Support formats like: 123 or 123:2 (product ID : quantity)
			$parts    = explode( ':', $product_data );
			$product_id = absint( $parts[0] );
			$quantity   = isset( $parts[1] ) ? absint( $parts[1] ) : 1;

			if ( $product_id > 0 && get_post_type( $product_id ) === 'product' ) {
				WC()->cart->add_to_cart( $product_id, $quantity );
			}
		}
	}
}