Fat Free Framework (F3): custom 404 page (and others errors)

Question

How I can handle my 404 custom page (and possibly other errors)?

I just tried in routing part to add

GET /@codes /WebController->error

Answer 1

You don't have to define a route for this. F3 will automatically generate a 404 status code for any non-defined route.

If you want to define a custom error page, you need to set the ONERROR variable.

Here's a quick example:

$f3->route('GET /','App->home');
$f3->set('ONERROR',function($f3){
  echo \Template::instance()->render('error.html');
});
$f3->run();

with error.html defined as:

  
{{@ERROR.text}}
  
Error code: {{@ERROR.code}}

Now if you call any non-defined route like /foo, the template error.html will be rendered with a 404 status code.

NB: this works for other error codes. Other error codes are triggered by F3 or your application with the command $f3->error($status), $status being any valid HTTP status code (404, 500, 403, etc...)