DevPress Price Testing - A one file WordPress plugin for testing pricing in WooCommerce.

devpress-price-testing.php

<?php
/**
 * Plugin Name: DevPress Price Testing
 * Plugin URI: https://devpress.com
 * Description: A plugin to test different pricing variants based on cookies.
 * Version: 1.0.0
 * Author: DevPress
 * Author URI: https://devpress.com
 * Text Domain: devpress-price-testing
 *
 * @package DevPress
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Main plugin class
 */
class DevPress_Price_Testing {

	/**
	 * Singleton instance
	 *
	 * @var DevPress_Price_Testing
	 */
	private static $instance = null;

	/**
	 * Get the singleton instance
	 *
	 * @return DevPress_Price_Testing
	 */
	public static function get_instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor
	 */
	private function __construct() {
		// Hook into WooCommerce
		add_filter( 'woocommerce_product_get_price', [ $this, 'pricing_test' ], 10, 2 );
		add_filter( 'woocommerce_product_get_regular_price', [ $this, 'pricing_test' ], 10, 2 );
	}

	/**
	 * Return the value of the pricing test cookie if it is set.
	 *
	 * @return string
	 */
	public static function get_pricing_test_cookie_value() {
		$cookie_value = isset( $_COOKIE['pricing_test'] ) ? sanitize_text_field( $_COOKIE['pricing_test'] ) : '';

		// Return early if the cookie is not set to one our accepted variants.
		$variants = [ 'v1', 'v2' ];
		if ( ! in_array( $cookie_value, $variants, true ) ) {
			return '';
		}

		return $cookie_value;
	}

	/**
	 * Pricing test.
	 *
	 * To test, you can set the cookie in your browser with the following command:
	 * document.cookie = "pricing_test=v1; path=/";
	 * 
	 * You can remove the cookie with:
	 * document.cookie = "pricing_test=; path=/; expires=0";
	 *
	 * @param float       $price
	 * @param \WC_Product $product
	 *
	 * @return float
	 */
	public function pricing_test( $price, $product ) {
		$cookie_value = self::get_pricing_test_cookie_value();

		// If the cookie is not set, return the original price.
		if ( $cookie_value === '' ) {
			return $price;
		}

		if ( ! $product instanceof \WC_Product ) {
			return $price;
		}

		$sku = $product->get_sku();
		if ( ! $sku ) {
			return $price;
		}

		$price_mapping = [];

		// Updated pricing to test in v1 variant.
		$price_mapping['v1'] = [
			'TEST01'  => '50',
		];

		// If the product sku is in the price mapping array for the variant, return the new price.
		if ( isset( $price_mapping[ $cookie_value ] ) && array_key_exists( $sku, $price_mapping[ $cookie_value ] ) ) {
			$price = $price_mapping[ $cookie_value ][ $sku ];
		}

		return $price;
	}
}

// Initialize the plugin
DevPress_Price_Testing::get_instance();