README

A flexible discounting library for PHP with zero dependency. It is typically used to provide discounts on products, but can be used for any kind of discounting where flexibility is required.

Features

• Zero dependency
• Flexible discounting
• Extensible
• Supports multiple discount types:
  • Percentage
  • Fixed amount
  • BOGO / Buy N get M free / Buy N for the Price of M
  • Buy N at a price
• Discount stacking: any type/multiple discounts can be applied to a single/multiple items. Zero limitation.
• Restricting discounts:
  • to specific items
  • to a minimum purchase amount
  • to minimum quantity
• etc.

Installation

Install the latest version with

composer require autepos/discount

Basic Usage

use Autepos\Discount\Processors\LinearDiscountProcessor;
use Autepos\Discount\Contracts\DiscountableDevice;
use Autepos\Discount\Contracts\DiscountInstrument;

class Order implements DiscountableDevice
{
    //...
}

class PromotionCode implements DiscountInstrument
{
    //...
}


$discountableDevice = new Order();
$discountInstrument = new PromotionCode();

$processor = new LinearDiscountProcessor();
$processor->addDiscountableDevice($discountableDevice)
          ->addDiscountInstrument($discountInstrument);
$discountLineList = $processor->calculate();

// Get the discount amount
$discountAmount = $discountLineList->amount();

// Persist the discount
$discountLineList->redeem();

Adding a custom discount processor

use Autepos\Discount\Processors\Contracts\DiscountProcessor;

class CustomDiscountProcessor implements DiscountProcessor
{
    public function getProcessor(): string
    {
        return 'custom';
    }

    //...
}