gistfile1.php

<?php

paramsFromArgs($class, $method, $args) {
  ...
}

class Foo {
  public function method($a, $b, $c) {
    $params = static::paramsFromArgs(__CLASS__, __METHOD__, func_get_args());
    var_dump($params);
  }
}

$foo = new Foo();

$foo->method(1, null, 3);

>>> ['a'=>1, 'c'=>3]