网页爬虫 - 请问PHP怎么使用xpath解析html内容呢？

Question

在网上查看了很多相关资料，但都是PHP用xpath解析xml的，请问PHP有没有相关的函数或是类库能解析html吗？谢谢

伊谢尔伦 · Answer

直接用zend-dom吧，方便多了！
http://framework.zend.com/manual/2.3/en/modules/zend.dom.query.html
引入不用教了吧？

怪我咯 · Answer

$url = 'http://www.baidu.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_FILE, fopen('php://stdout', 'w'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_URL, $url);
$html = curl_exec($ch); 
curl_close($ch);

// create document object model
$dom = new DOMDocument();
// load html into document object model
@$dom->loadHTML($html);
// create domxpath instance
$xPath = new DOMXPath($dom);
// get all elements with a particular id and then loop through and print the href attribute
$elements = $xPath->query('//*[@id="lg"]/img/@src');
foreach ($elements as $e) {
  echo ($e->nodeValue);
}

差不多这样的