original_string: public function add(string $name, callable $callback): self
      {
          call_user_func($this->addCallback, $name, $callback);
          return $this;
      }
code: public function add(string $name, callable $callback): self
      {
          call_user_func($this->addCallback, $name, $callback);
          return $this;
      }
code_tokens: public function add ( string $ name , callable $ callback ) : self { call_user_func ( $ this -> addCallback , $ name , $ callback ) ; return $ this ; }
docstring: Creates a new shortcut.
  
  @param string $name The name of the shortcut property.
  @param callable $callback The callback to return the shortcut value.
  @return self Returns a reference to itself.
docstring_tokens: Creates a new shortcut .