在PHP中解析HTML文档 - Parsing HTML documents in PHP

Parsing HTML documents in PHP

本文关键字：HTML 文档 PHP | 更新日期: 2023-09-27

我有一个PHP代码，它从Web服务中提取信息

<?php
$speechText=$_POST['spokentext'];
echo $speechText.'!';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://nlp.stanford.edu:8080/parser/index.jsp');
curl_setopt($ch, CURLOPT_POST, 3);
curl_setopt($ch,CURLOPT_POSTFIELDS, "query=".$speechText."&parserSelect=English&parse=Parse");
$result = curl_exec($ch);
//echo $result;
curl_close($ch);
$dom = new DOMDocument();
$dom->loadHTML($result); 
$xpath = new DOMXPath($dom);
$result = $xpath->query('/html/body/div[2]/div[5]/pre');
echo $result->item(0)->nodeValue;
?>

变量$result包含返回的HTML文档。我想通过解析它来提取一些信息。我使用的是内置的DOM解析器，但我收到了这个错误-

PHP Notice:  Trying to get property of non-object

错误是什么？

p.S.-我在编程方面是一个完全的n00b：p

它非常简单的

$dom = new DOMDocument();
@$dom->loadHTML($html);
$xpath = new DOMXpath($dom);
$elements = $xpath->query("/html/body/div[2]/div[6]/pre");
$typed_dependencies_collapsed = array();
if (!is_null($elements)) {
  foreach ($elements as $element) {
    $nodes = $element->childNodes;
    foreach ($nodes as $node) {
      echo $node->nodeValue."'n";
      array_push($typed_dependencies_collapsed,$node->nodeValue);
    }
  }
}