php - How does Symfony2 passes the parameter of a URI to the controller Action method? -

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i have started learning symfony2. came across doubt: if have route:

# app/config/routing.yml hello:     path:      /hello/{name}     defaults:  { _controller: acmehellobundle:hello:index }

and controller: 

// src/acme/hellobundle/controller/hellocontroller.php namespace acme\hellobundle\controller; use symfony\component\httpfoundation\response; class hellocontroller {     public function indexaction($name)     {         return new response('<html><body>ciao '.$name.'!</body></html>');     } }

internally symfony2 (inside app/bootstrap.php.cache) calls call user_func_array() php built-in function:

$arguments = $this->resolver->getarguments($request, $controller); $response = call_user_func_array($controller, $arguments);

and call getarguments() method returns array of arguments pass action method. if controller were:

// src/acme/hellobundle/controller/hellocontroller.php namespace acme\hellobundle\controller; use symfony\component\httpfoundation\response; class hellocontroller {     public function indexaction($n)     {         return new response('<html><body>ciao '.$n.'!</body></html>');     } }

symfony have complained runtimeexception because no param $n set.

my question is: how symfony controls behaviour, mean, if route has {name} param, why controller must have action method $name parameter , parameter must called $name?

cause in plain php, work:

$name = 'alex'; function indexaction($n) {    echo $n; } $f = 'indexaction'; $arguments = array($name); call_user_func_array($f, $arguments);

even if functions signature accepts param named $n , not $name.

i hope question understandable, if not, please tell me , make edit.

thanks attention!

it's done in controller resolver httpkernel/controller/controllerresolver.php via getarguments() & doarguments().

for better understanding, find need in getting controller arguments

edit: answer comment.

does symfony use reflectionparameter class internally in order keep track of params of method's signature , match them route params?

yes, controllerresolver uses:

here how:

 public function getarguments(request $request, $controller)     {         if (is_array($controller)) {             $r = new \reflectionmethod($controller[0], $controller[1]);         } elseif (is_object($controller) && !$controller instanceof \closure) {             $r = new \reflectionobject($controller);             $r = $r->getmethod('__invoke');         } else {             $r = new \reflectionfunction($controller);         }         return $this->dogetarguments($request, $controller, $r->getparameters());     }

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