要编写自定义piwik插件，我正在遵循教程：http://piwik.org/blog/2014/09/create-widget-introducing-piwik-platform/
如何访问 piwik 在插件中收到的请求数据？
上面链接中的示例小部件：
class Widgets extends 'Piwik'Plugin'Widgets
{
/**
* Here you can define the category the widget belongs to. You can reuse any existing widget category or define your own category.
* @var string
*/
protected $category = 'ExampleCompany';
/**
* Here you can add one or multiple widgets. You can add a widget by calling the method "addWidget()" and pass the name of the widget as well as a method name that should be called to render the widget. The method can be defined either directly here in this widget class or in the controller in case you want to reuse the same action for instance in the menu etc.
*/
protected function init()
{
$this->addWidget('Example Widget Name', $method = 'myExampleWidget');
$this->addWidget('Example Widget 2', $method = 'myExampleWidget', $params = array('myparam' => 'myvalue'));
}
/**
* This method renders a widget as defined in "init()". It's on you how to generate the content of the widget. As long as you return a string everything is fine. You can use for instance a "Piwik'View" to render a twig template. In such a case don't forget to create a twig template (eg. myViewTemplate.twig) in the "templates" directory of your plugin.
*
* @return string
*/
public function myExampleWidget()
{
$view = new View('@MyWidgetPlugin/myViewTemplate');
return $view->render();
}
}
如何在插件中访问piwik为每个访问者请求接收的数据，例如请求标头字段？
访问名为"imageId"的变量：
$imageId = Common::getRequestVar('imageId');
关于标题：Piwik 通过 ProxyHeaders 类提供标头方法的列表。目前只有两种公共静态方法，您可能对此感兴趣： ProxyHeaders::getProxyClientHeaders ， 使用
'HTTP_CF_CONNECTING_IP',
'HTTP_CLIENT_IP',
'HTTP_X_FORWARDED_FOR',
和ProxyHeaders::getProxyHostHeaders
'HTTP_X_FORWARDED_HOST'
这两种方法都调用另一个，它是私有的：
/**
* Get headers present in the HTTP request
*
* @param array $recognizedHeaders
* @return array HTTP headers
*/
private static function getHeaders($recognizedHeaders)
{
$headers = array();
foreach ($recognizedHeaders as $header) {
if (isset($_SERVER[$header])) {
$headers[] = $header;
}
}
return $headers;
}
因为方法 getHeaders 是私有的，它实际上并没有做你想要的，所以最简单的方法可能是直接从 $_SERVER 读取标头。
它将以这种方式工作：如果你有一个名称为"my-test-header"和值为"123"的标头：
$_SERVER['HTTP_MY_TEST_HEADER'] // returns "123"
"Content-Type" => 'application/x-www-form-urlencoded'
$_SERVER['HTTP_CONTENT_TYPE'] // returns "application/x-www-form-urlencoded"
等。
关于Web服务器的一个注意事项，无论是Apache还是Nginx或任何其他服务器，配置在这里都非常重要，特别是对于HTTP_X_FORWARDED_FOR标头。