由于 PHP 5.6 不支持 throw 关键字后面直接使用 \InvalidArgumentException 这种命名空间方式，我们需要对其进行调整。以下是针对 PHP 5.6 版本兼容的代码示例：

// application/Interfaces/LogisticsCompany.php
namespace app\Interfaces;interface LogisticsCompany
{public function placeOrder($orderInfo);public function getSupportedDestinations();
}// application/Service/Logistics/CompanyA.php
namespace app\Service\Logistics;use app\Interfaces\LogisticsCompany;class CompanyA implements LogisticsCompany
{// 实现下单方法public function placeOrder($orderInfo){// 具体的下单逻辑...}// 实现获取支持目的地方法public function getSupportedDestinations(){// 具体的获取目的地逻辑...}
}// 同样方式为其他物流公司创建类，例如：CompanyB, CompanyC 等// application/Service/LogisticsFactory.php
namespace app\Service;class LogisticsFactory
{private static $companies = array('company_a' => 'app\\Service\\Logistics\\CompanyA','company_b' => 'app\\Service\\Logistics\\CompanyB',// 更多物流公司...);public static function create($name){if (!isset(self::$companies[$name])) {trigger_error("Invalid logistics company: {$name}", E_USER_ERROR);return null; // 或者抛出一个在PHP 5.6中可用的异常，如自定义异常或使用trigger_error}$className = self::$companies[$name];if (!class_exists($className)) {trigger_error("Class not found: {$className}", E_USER_ERROR);return null;}return new $className();}
}// application/controller/YourController.php
namespace app\controller;use app\Interfaces\LogisticsCompany;
use app\Service\LogisticsFactory;class YourController
{public function placeOrderAction(){$logisticsCompany = LogisticsFactory::create('company_a');if (!$logisticsCompany) {// 处理错误情况，例如返回错误信息或者跳转到错误页面return;}$orderInfo = []; // 假设这是订单信息$logisticsCompany->placeOrder($orderInfo);// 获取支持的目的地$destinations = $logisticsCompany->getSupportedDestinations();}
}