php反射学习之依赖注入示例

<?phpif (PHP_SAPI != 'cli') {  exit('Please run it in terminal!');}if ($argc < 3) {  exit('At least 2 arguments needed!');}$controller = ucfirst($argv[1]) . 'Controller';$action = 'action' . ucfirst($argv[2]);// 检查类是否存在if (!class_exists($controller)) {  exit("Class $controller does not existed!");}// 获取类的反射$reflector = new ReflectionClass($controller);// 检查方法是否存在if (!$reflector->hasMethod($action)) {  exit("Method $action does not existed!");}// 取类的构造函数$constructor = $reflector->getConstructor();// 取构造函数的参数$parameters = $constructor->getParameters();// 遍历参数foreach ($parameters as $key => $parameter) {  // 获取参数声明的类  $injector = new ReflectionClass($parameter->getClass()->name);  // 实例化参数声明类并填入参数列表  $parameters[$key] = $injector->newInstance();}// 使用参数列表实例 controller 类$instance = $reflector->newInstanceArgs($parameters);// 执行$instance->$action();class HelloController{  private $model;  public function __construct(TestModel $model)  {    $this->model = $model;  }  public function actionWorld()  {    echo $this->model->property, PHP_EOL;  }}class TestModel{  public $property = 'property';}