expand blade extension example

blade.md

@@ -202,13 +202,39 @@ The `@inject` directive may be used to retrieve a service from the Laravel [serv
 <a name="extending-blade"></a>
 ## Extending Blade
 
-Blade even allows you to define your own custom directives. You can use the `directive` method to register a directive. When the Blade compiler encounters the directive, it calls the provided callback with its parameter. This allows you to replace your directives with any logic as complex as you want.
+Blade even allows you to define your own custom directives. You can use the `directive` method to register a directive. When the Blade compiler encounters the directive, it calls the provided callback with its parameter.
 
 The following example creates a `@datetime($var)` directive which formats a given `$var`:
 
- Blade::directive('datetime', function($expression) {
-  return "<?php echo with{$expression}->format('m/d/Y H:i'); ?>";
- });
+ <?php namespace App\Providers;
+
+ use Blade;
+ use Illuminate\Support\ServiceProvider;
+
+ class AppServiceProvider extends ServiceProvider
+ {
+  /**
+  * Perform post-registration booting of services.
+  *
+  * @return void
+  */
+  public function boot()
+  {
+  Blade::directive('datetime', function($expression) {
+  return "<?php echo with{$expression}->format('m/d/Y H:i'); ?>";
+  });
+  }
+
+  /**
+  * Register bindings in the container.
+  *
+  * @return void
+  */
+  public function register()
+  {
+  //
+  }
+ }
 
 As you can see, Laravel's `with` helper function was used in this directive. The `with` helper simply returns the object / value it is given, allowing for convenient method chaining. The final PHP generated by this directive will be: