WooCommerce discount: buy one get one 50% off with a notice - php

Question

After my previous question WooCommerce discount: buy one get one 50% off I want to add custom notice to the cart, whenever a particular product(not all the products) gets added to the cart.
I want to check the quantity first, if it's 1 then I want to display a notice to increase the quantity of that product. I have figured something by myself from the internet and I don't think my solution is right:
add_action( 'wp', 'sp_custom_notice' );
function sp_custom_notice() {
if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
//to display notice only on cart page
if ( ! is_cart() ) {
return;
}
global $product;
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;
if($product_id == 15730){
//check for quantify if equal to 1 in cart
wc_clear_notices();
wc_add_notice( __("Add one more to get 50% off on 2nd product"), 'notice');
}
}
It will be great if anyone can help me on this.

Answer 1

Updated July 2020
If you are still using the code from my answer to your previous question, you can change it a bit to get this working too:
add_action('woocommerce_cart_calculate_fees', 'add_custom_discount_2nd_at_50', 10, 1 );
function add_custom_discount_2nd_at_50( $cart ){
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// YOUR SETTINGS:
$targeted_product_id = 40; // Set HERE your targeted product ID
// Initializing variables
$discount = $qty_notice = 0;
$items_prices = array();
// Loop through cart items
foreach ( $cart->get_cart() as $key => $cart_item ) {
if( in_array( $targeted_product_id, [$cart_item['product_id'], $cart_item['variation_id']] ) ){
$quantity = (int) $cart_item['quantity'];
$qty_notice += $quantity;
for( $i = 0; $i < $quantity; $i++ ) {
$items_prices[] = floatval( $cart_item['data']->get_price());
}
}
}
$count_items = count($items_prices); // Count items
rsort($items_prices); // Sorting prices descending order
if( $count_items > 1 ) {
foreach( $items_prices as $key => $price ) {
if( $key % 2 == 1 )
$discount -= number_format( $price / 2, 2 );
}
}
// Applying the discount
if( $discount != 0 ){
$cart->add_fee('Buy one get one 50% off', $discount );
// Displaying a custom notice (optional)
wc_clear_notices(); // clear other notices on checkout page.
if( ! is_checkout() ){
wc_add_notice( __("You get 50% of discount on the 2nd item"), 'notice');
}
}
// Display a custom notice on cart page when quantity is equal to 1.
elseif( $qty_notice == 1 ){
wc_clear_notices(); // clear other notices on checkout page.
if( ! is_checkout() ){
wc_add_notice( __( "Add one more to get 50% off on 2nd item" ), 'notice');
}
}
}
Code goes in functions.php file of your active child theme (or active theme) Tested and works.
Note: The wc_add_notice() function absolutely don't need to be echoed

Answer 2

You did pretty good code some minor changes are required try below code :
add_action('woocommerce_before_cart', 'sp_custom_notice');
function sp_custom_notice() {
if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
//to display notice only on cart page
if ( ! is_cart() ) {
return;
}
global $woocommerce;
$items = $woocommerce->cart->get_cart();
foreach($items as $item => $values) {
$_product = wc_get_product( $values['data']->get_id());
if($values['data']->get_id() == 190 && $values['quantity'] == 1 ){
wc_clear_notices();
echo wc_add_notice( __("Add one more to get 50% off on 2nd product"), 'notice');
}
}
}