WooCommerce Dynamic Shop Wide Global Discount

wcgd.php

/*
 * @snippet       WooCommerce Shope Wide Global Discount
 * @author        https://gist.github.com/Acephalia
 * @caffeinate    https://buymeacoffee.com/acephaliax
 * @Usage         Activate via code snippets and change discount amount at line 11. 
 */


class WC_Dynamic_Global_Discount {
    // CHANGE DISCOUNT PERCENTAGE HERE
    private static $discount_percentage = 10; // Set your desired discount percentage (e.g., 10 for 10%)
    
    public static function init() {
        add_action('woocommerce_before_calculate_totals', [__CLASS__, 'apply_dynamic_discount']);
        add_filter('woocommerce_product_get_sale_price', [__CLASS__, 'modify_sale_price'], 10, 2);
        add_filter('woocommerce_product_get_price', [__CLASS__, 'modify_price'], 10, 2);
    }

    
     //Calculate discounted price with proper type handling
     
    private static function calculate_discount($price) {
        if (!is_numeric($price)) {
            return $price;
        }
        
        $price = floatval($price);
        if ($price <= 0) {
            return $price;
        }
        
        return $price * (1 - (self::$discount_percentage / 100));
    }

   //Dynamically modify sale price for all products
    
    public static function modify_sale_price($sale_price, $product) {
        $regular_price = $product->get_regular_price();
        if (empty($regular_price)) {
            return $sale_price;
        }
        
        return self::calculate_discount($regular_price);
    }

    //Dynamically modify price for all products
     
    public static function modify_price($price, $product) {
        $regular_price = $product->get_regular_price();
        if (empty($regular_price)) {
            return $price;
        }
        
        return self::calculate_discount($regular_price);
    }

    //Apply dynamic discount during cart calculation
   
    public static function apply_dynamic_discount($cart) {
        if (is_admin() && !defined('DOING_AJAX')) return;
        
        foreach ($cart->get_cart() as $cart_item_key => $cart_item) {
            $product = $cart_item['data'];
            $original_price = $product->get_regular_price();
            
            if (!empty($original_price)) {
                $discounted_price = self::calculate_discount($original_price);
                $cart_item['data']->set_price($discounted_price);
            }
        }
    }
}

// Initialize the dynamic discount
add_action('init', ['WC_Dynamic_Global_Discount', 'init']);

//Add admin notice 
add_action('admin_notices', function() {
    $discount = WC_Dynamic_Global_Discount::$discount_percentage;
    echo '<div class="notice notice-warning">
        <p>' . esc_html($discount) . '% Discount is currently active for all products</p>
    </div>';
});

This code

• Creates a global discount system that applies the specified percentage off to all products in your store
• Modifies products' sale price and regular price to show the discount both on product pages and in the cart
• Automatically applies the discount during cart calculations
• Shows amount saved in cart
• Includes Admin notice in the WordPress dashboard reminding admins that the discount is active

Support: https://buymeacoffee.com/acephaliax