Symfony2可重用的代码段功能

Question

I am using Symfony2 lately and I keep wondering when I should create a service and when I should create a class.

For example I do have this little snippet function that is a very reusable piece of code. So because of that I do not want that piece of code in my controller. Meaning that I would want to use it anywhere in my bundle.

It's very simple, but it basically generates a full url for me based on a slug/path. Now please note that this could be anything else for example a customStringGenerator() or what so ever.

The snippet:

public function generateUrlFromPath(Request $request, $path)
{
    return $request->getScheme() . '://' . $request->getHttpHost() . $request->getBasePath() . $path;
}

Now I could make some sort of Toolkit or UrlHelper class and define it as a service so I can easily inject the Request object, but it seems overdone for me to create a service for such a simple method.

What would anyone suggest in this case? What would you guys do when you have created reusable functions?

Thanks for your help so far.

Answer 1

For reusability, I use:

• Services (When I need to inject other dependencies through constructor), so you don't have to do it manually everytime.

• Helper controller, which my controllers extend.

• Classes with public static functions.

• Traits (PHP >= 5.4), when you need to share same methods in a few classes, to help overcome single class inheritance limitation.

For your function up there, I would personally make a protected function inside a Helper controller, but a service would be ok too, even it is such a small piece of code. You might end up writing more code to that service later.