Ready to dive in and don't want to read through all that text below? Just consult the [examples](examples) folder and check which type of action that your want to accomplish.
The real power of this resolver is in its capability to expand partial class names into fully qualified class names; but in order to do that we need an additional `\phpDocumentor\Reflection\Types\Context` class that will inform the resolver in which namespace the given expression occurs and which namespace aliases (or imports) apply.
### Resolving nullable types
Php 7.1 introduced nullable types e.g. `?string`. Type resolver will resolve the original type without the nullable notation `?`
just like it would do without the `?`. After that the type is wrapped in a `\phpDocumentor\Reflection\Types\Nullable` object.
The `Nullable` type has a method to fetch the actual type.
A Fully Qualified Structural Element Name is a reference to another element in your code bases and can be resolved using the `\phpDocumentor\Reflection\FqsenResolver` class' `resolve` method, like this:
In this example we resolve a Fully Qualified Structural Element Name (meaning that it includes the full namespace, class name and element name) and receive a Value Object of type `\phpDocumentor\Reflection\Fqsen`.
The real power of this resolver is in its capability to expand partial element names into Fully Qualified Structural Element Names; but in order to do that we need an additional `\phpDocumentor\Reflection\Types\Context` class that will inform the resolver in which namespace the given expression occurs and which namespace aliases (or imports) apply.
For the resolvers to know how to expand partial names you have to provide a bit of _Context_ for them by instantiating a new class named `\phpDocumentor\Reflection\Types\Context` with the name of the namespace and the aliases that are in play.
Or by using the `\phpDocumentor\Reflection\Types\ContextFactory` to instantiate a new context based on a Reflector object or by providing the namespace that you'd like to extract and the source code of the file in which the given type expression occurs.
After you have obtained a Context it is just a matter of passing it along with the `resolve` method of either Resolver class as second argument and the Resolvers will take this into account when resolving partial names.
When you do this you will receive an object of class `\phpDocumentor\Reflection\Types\Object_` for which you can call the `getFqsen` method to receive a Value Object that represents the complete FQSEN. So that would be `phpDocumentor\Reflection\Types\Context`.
> The resolve method of the TypeResolver only returns object with the interface `Type` and the FQSEN is a common type that does not represent a Type. Also: in some cases a type can represent an "Untyped Object", meaning that it is an object (signified by the `object` keyword) but does not refer to a specific element using an FQSEN.
Another example is on how to resolve the FQSEN of a method as can be seen with the `@see` tag in the example above. To resolve that you can do the following:
Because Classy is a Class in the current namespace its FQSEN will have the `My\Example` namespace and by calling the `resolve` method of the FQSEN Resolver you will receive an `Fqsen` object that refers to `\My\Example\Classy::otherFunction()`.