php反射学习之依赖注入示例

?php
if (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';
}