original_string: protected function parseKey($key)
      {
          if (!isset($this->keys[$key])) {
              $this->keys[$key] = explode($this->separator, $key);
          }
  
          return $this->keys[$key];
      }
code: protected function parseKey($key)
      {
          if (!isset($this->keys[$key])) {
              $this->keys[$key] = explode($this->separator, $key);
          }
  
          return $this->keys[$key];
      }
code_tokens: protected function parseKey ( $ key ) { if ( ! isset ( $ this -> keys [ $ key ] ) ) { $ this -> keys [ $ key ] = explode ( $ this -> separator , $ key ) ; } return $ this -> keys [ $ key ] ; }
docstring: Parse a separated key and cache the result
  @param  string $key
  @return array
docstring_tokens: Parse a separated key and cache the result