Pass extra parameters to silex error handler callback function - silex

Question

I'm building an app with Silex and Twig where I have my route handlers defined in this way (standard way):
//routes.php
$app->get('/pageA',function () use($app){
//Display something
});
$app->get('/pageB',function () use($app){
//Display something
});
$app->post('/pageB',function (Request $req) use($app){
//Process something
});
And then I have set up an error handler to manager possible errors that are thrown inside the route handlers, like this:
//routes.php
$app->post('/pageB',function (Request $req) use($app){
//Do something, but an error occurs..
$app->abort(404,"Page not found");
});
//errors.php
$app->error(function (\Exception $e, $code) use($app) {
switch($code){
case 404:
return $app['twig']->render('404.twig',array('error'=>$e->getMessage()));
//Other error codes...
default:
//return something
}
});
What I would like to do is pass an extra parameter from the route handler to the callback function of the error handler, like this:
//routes.php
$app->post('/pageB',function (Request $req) use($app){
//Do something, but an error occurs..
$app->abort(404,"Page not found","My extra parameter");
});
//errors.php
$app->error(function (\Exception $e, $code,$extra_param=null) use($app) {
if(isset($extra_param))
//Process the error in a different way
else{ //Standard way
switch($code){
case 404:
return $app['twig']->render('404.twig',array('error'=>$e->getMessage()));
//Other error codes...
default:
//return something
}
}
});
Can this be done?

Answer 1

This might not be the most elegant solution but you could probably just add an array to $app.
$app['my_param_bag'] = array();
$app->get('/pageB', function(Request $request) use ($app) {
$app['my_param_bag'] = array('foo', 'bar', 'baz');
$app->abort(404, "Page not found");
});
$app->error(function (\Exception $e, $code) use($app) {
error_log(print_r($app['my_param_bag'],1).' '.__FILE__.' '.__LINE__,0);
if(!empty($app['my_param_bag'])) {
// do something with the params
}
else{
switch($code){
case 404:
return $app['twig']->render('404.html.twig',array('error'=>$e->getMessage()));
default:
}
}
});
I'm not sure about how you have your application setup but for me I was able to add this empty array in a configuration file.