尝试将类名作为字符串，名称空间问题传递时找不到类

Question

Here is a method, in which a string is passed, using that string an instance is created. Example method:

public function action($actionType)
{
    //var_dump(new $actionType);

    if (!class_exists($actionType)) {
        //throw new Exception

    }

    if (!(new $actionType) instanceof ActionInterface) {
        ////throw new Exception
    }
    $actionType = new $actionType;
    echo $actionType->doAction();
}

But I am getting an error of class not found, however when I manually write the class name or manually append the namespace this way $actionType = __namespace__ . "\\$actionType";, then error goes. Why is that happening?

Answer 1

Try this:

public function action($actionType) {
     //var_dump(new $actionType);
     if (!class_exists($actionType)) {
       //throw new Exception
     }
     $actionType = new $actionType;
     if (!($actionType instanceof ActionInterface)) {
        ////throw new Exception
     }

     echo $actionType->doAction();
}