How to get the parameters of a closure in php

Question

How could I pick up the parameters of a closure?
I was doing some tests and I gave one var_dump in a closure and she returned me that

object(Closure)#5 (1) {
  ["parameter"]=> 
    array(2) {
    ["$val"]=>
    string(10) ""
    ["$val2"]=>
    string(10) ""
  }
}

And I got the doubt, how I access the array 'paramenter'?

var_dump("<pre>", function($val, $val2){ });

Answer 1

To get the parameters of an anonymous function can be done with Reflectionfunction, example:

<?php

$fs = function($val, $val2){ return $val + $val2; };

$reflection = new ReflectionFunction($fs);
$arguments  = $reflection->getParameters();
var_dump($arguments);

and on his departure from command var_dump:

array(2) {
  [0]=>
  object(ReflectionParameter)#3 (1) {
    ["name"]=>
    string(3) "val"
  }
  [1]=>
  object(ReflectionParameter)#4 (1) {
    ["name"]=>
    string(4) "val2"
  }
}

^{Reference: Deducing PHP Closure Parameters}