Writing PHP code with PHP is not very easy. You are constantly switching between the context of the code that generates the code and the code that is to be generated (see, you lost it already!). Some variables are available in the first context, some in the second, and you will have to pass the right values in the right way. One of the areas in Symfony-land where you will have to do these things is when you extend Twig by hooking into the parser and defining your own tags. A tag for example is the “for” in