Unset WooCommerce Free Shipping if certain products are in the cart

gistfile1.txt

/**
 * Check the cart for specific products, remove Free Shipping method if they are present
 *
 * Add the code to your theme functions.php file
 */
add_filter( 'woocommerce_package_rates', 'unset_free_shipping_method' , 10, 2 );
function unset_free_shipping_method( $rates, $package ) {
 
	/**
	 * Setup an array or products
	 *
	 * eg $removeshipping_array = array( '7246' );
	 * or $removeshipping_array = array( '7246','7500','4567' );
	 */
	$removeshipping_array = array( '916' );
 
	/**
	 * loop through the cart looking for the products in the array above
	 * and unset the Free shipping methods as necessary
	 */ 
	foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
 
		if( in_array( $values['product_id'], $removeshipping_array ) ) {
		
      			/**
			 * Unset the shipping methods here
       			 */
			unset( $rates['free_shipping'] );
 
			// The rates have been removed, no point in carrying on
			break;
 
		}
 
	}
 
	// Return what's left of the $rates array
	return $rates;
 
}