sfWebResponse::sendHttpHeaders PHP Method

    public function sendHttpHeaders()
    {
        if (!$this->options['send_http_headers']) {
            return;
        }
        // status
        $status = $this->options['http_protocol'] . ' ' . $this->statusCode . ' ' . $this->statusText;
        header($status);
        if (substr(php_sapi_name(), 0, 3) == 'cgi') {
            // fastcgi servers cannot send this status information because it was sent by them already due to the HTT/1.0 line
            // so we can safely unset them. see ticket #3191
            unset($this->headers['Status']);
        }
        if ($this->options['logging']) {
            $this->dispatcher->notify(new sfEvent($this, 'application.log', array(sprintf('Send status "%s"', $status))));
        }
        // headers
        if (!$this->getHttpHeader('Content-Type')) {
            $this->setContentType($this->options['content_type']);
        }
        foreach ($this->headers as $name => $value) {
            header($name . ': ' . $value);
            if ($value != '' && $this->options['logging']) {
                $this->dispatcher->notify(new sfEvent($this, 'application.log', array(sprintf('Send header "%s: %s"', $name, $value))));
            }
        }
        // cookies
        foreach ($this->cookies as $cookie) {
            setrawcookie($cookie['name'], $cookie['value'], $cookie['expire'], $cookie['path'], $cookie['domain'], $cookie['secure'], $cookie['httpOnly']);
            if ($this->options['logging']) {
                $this->dispatcher->notify(new sfEvent($this, 'application.log', array(sprintf('Send cookie "%s": "%s"', $cookie['name'], $cookie['value']))));
            }
        }
        // prevent resending the headers
        $this->options['send_http_headers'] = false;
    }