Using ::class dynamically

I want to create a helper method for my app where I pass a class name as a string. The method should then resolve the string into a fully qualified class name. So with namespace.

This is what I want to do. However, my IDE (PHPStorm) says: "is only allowed on objects"

public function(string $className)
{
    return $className::class;
}

Question: What do I have to change to make this dynamic?

If the class is always in a specific namespace, then you can hard code it and also check if the class exists. You can handle the error as you need to, this just throws an exception.

Having the classes in a specific namespace also allows you to limit the possible classes it uses and it also can help developers as they can see where these classes are defined.

public function className(string $className)
{
    $fullName = '\YourNameSpace\\' . $className;
    if (class_exists($fullName) === false) {
        throw new Exception('Class not found');
    }

    return $fullName;
}