headers = array_merge($this->headers, $headers); } function isSessionStarted() { return $this->sessionStarted; } function setSessionValue($name, $value) { $this->session[$name] = $value; } function hasSessionValue($name) { return array_key_exists($name, $this->session); } function getSessionValue($name) { return $this->session[$name]; } function deleteSessionValue($name) { unset($this->session[$name]); } }