Created Overriding (markdown)

Overriding.md

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+Flight allows you to override its default functionality to suit your own needs, without having to modify any code.
+
+For example, when Flight cannot match a URL to a route, it invokes the `notFound` method which sends a generic HTTP 404 response.
+You can override this behavior by using the `map` method:
+
+    Flight::map('notFound', function(){
+        // Display custom 404 page
+        include 'errors/404.html';
+    });
+
+Flight also allows you to replace core components of the framework.
+For example you can replace the default Router class with your own custom class:
+
+    // Register your custom class
+    Flight::register('router', 'MyRouter');
+
+    // When Flight loads the Router instance, it will load your class
+    $myrouter = Flight::router();
+
+Framework methods like `map` and `register` however cannot be overridden. You will get an error if you try to do so.