code: public function getParameter($key, $default = null)
      {
          // Request _should_ contain get, post and cookies
          if (array_key_exists($key, $this->parameters)) {
              return $this->parameters[$key];
          }
          // We can also flatten out the variable names to see if they exist
          $flatKey = $this->flatten($key);
          foreach ($this->parameters as $index => $value) {
              if ($flatKey == $this->flatten($index)) {
                  return $value;
              }
          }
          return $default;
      }
docs: Look up the value of a requested parameter.
  
  A default can be specified. If the parameter is not found the default
  will be returned. The 'default' defaults to null.
  
  @param string $key
  @param bool $default
  @return mixed