getting function's argument names

Question

In PHP Consider this function:

function test($name, $age) {}

I need to somehow extract the parameter names (for generating custom documenta

Answer 1

It's 2019 and no one said this?

Just use get_defined_vars():

class Foo {
  public function bar($a, $b) {
    var_dump(get_defined_vars());
  }
}

(new Foo)->bar('first', 'second');

Result:

array(2) {
  ["a"]=>
  string(5) "first"
  ["b"]=>
  string(6) "second"
}