Change subtotal after coupon discount applied Woocommerce

 For my case i have cart.php woocommerce on custom template as bellow

  <td class="product-subtotal" data-title="<?php esc_attr_e( 'Subtotal', 'woocommerce' ); ?>">
                            <?php
                                echo apply_filters( 'woocommerce_cart_item_subtotal', WC()->cart->get_product_subtotal( $_product, $cart_item['quantity'] ), $cart_item, $cart_item_key ); // PHPCS: XSS ok.
                            ?>
                            
                        </td>

In my case i have a plan for change subtotal after coupon discount applied, and actually i have two method. 

First i can calculate the discount directly on cart.php like bellow

 <td class="product-subtotal" data-title="<?php esc_attr_e( 'Subtotal', 'woocommerce' ); ?>">
    <?php
    // Dapatkan subtotal produk tanpa diskon
    $original_subtotal = $_product->get_price() * $cart_item['quantity'];
 
    // Inisialisasi variabel diskon
    $total_discount = 0;
 
    // Loop melalui setiap kupon yang diterapkan
    foreach ( WC()->cart->get_coupons() as $code => $coupon ) {
        $coupon_amount = 0;
        if ( in_array( $product_id, $coupon->get_product_ids() ) || empty( $coupon->get_product_ids() ) ) {
            $discount_amount = WC()->cart->get_coupon_discount_amount( $code, WC()->cart->display_cart_ex_tax );
            $coupon_amount += $discount_amount / count( WC()->cart->get_cart() );
        }
        $total_discount += $coupon_amount;
    }
 
    // Hitung subtotal baru dengan mengurangi total diskon
    $new_subtotal = $original_subtotal - $total_discount;
 
    // Pastikan subtotal baru tidak negatif
    if ( $new_subtotal < 0 ) {
        $new_subtotal = 0;
    }
 
    // Tampilkan subtotal baru
    echo wc_price( $new_subtotal );
    ?>
</td>

But i think my first method makes my code looks untidy. So i have idea to replace wit funstions.php in my template

function custom_cart_item_subtotal( $subtotal, $cart_item, $cart_item_key ) {
    $product = $cart_item['data'];
    $quantity = $cart_item['quantity'];
    $original_subtotal = $product->get_price() * $quantity;

    // Initialize total discount
    $total_discount = 0;

    // Loop through applied coupons
    foreach ( WC()->cart->get_applied_coupons() as $code ) {
        $coupon = new WC_Coupon( $code ); // Instantiate WC_Coupon object for each applied coupon

        // Check if the coupon is valid for this product or any product
        if ( $coupon->is_valid_for_product( $product ) || $coupon->is_valid_for_product( 0 ) ) {
            // Calculate discount amount for the specific cart item
            $discount_amount = $coupon->get_discount_amount( $original_subtotal, $cart_item, WC()->cart->display_cart_ex_tax );
            $total_discount += $discount_amount;
        }
    }

    // Calculate new subtotal after applying discounts
    $new_subtotal = $original_subtotal - $total_discount;

    // Ensure subtotal is not negative
    if ( $new_subtotal < 0 ) {
        $new_subtotal = 0;
    }

    // Return formatted subtotal
    return wc_price( $new_subtotal );
}
add_filter( 'woocommerce_cart_item_subtotal', 'custom_cart_item_subtotal', 10, 3 );

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Ahmad Zaelani

Seorang laki - laki biasa yang senang duduk sendirian di pinggir pantai, pengagum embun pagi dan lembayung senja, suka blogging, coding dan jogging. Moto hidupnya adalah hidup santai dan simple