original_string: public function evenKey(array $storage)
      {
          return $this->filter($storage, function ($value, $key)
          {
              return $this->helper->math()->isEven($key);
          });
      }
code: public function evenKey(array $storage)
      {
          return $this->filter($storage, function ($value, $key)
          {
              return $this->helper->math()->isEven($key);
          });
      }
code_tokens: public function evenKey ( array $ storage ) { return $ this -> filter ( $ storage , function ( $ value , $ key ) { return $ this -> helper -> math ( ) -> isEven ( $ key ) ; } ) ; }
docstring: 1=>'', 3=>''...
  
  @param array $storage
  
  @return array
docstring_tokens: 1 = > 3 = > ...