filterXpath和filter有什么区别？ [关闭]

I came accorss these when learning Goutte but I don't know how are they different?

filterXPath allows you to filter by an XPath expression, while filter allows you to filter by CSS selector. Ex:

$crawler = $crawler->filterXPath('descendant-or-self::body/p');
$crawler = $crawler->filter('body > p');