Symfony Dom 爬虫缺少节点，行为不一致

Question

使用此代码：

use Symfony\Component\DomCrawler\Crawler;
require_once(__DIR__ . '/../vendor/autoload.php');

$html = <<<'HTML'
<!DOCTYPE html>

<html>
    <body>
        <p class="message">Hello World!</p>
        <p>Hello Crawler!</p>
        <p>OUTSIDE
            <span>
                Child SPAN
            </span>
            <div>
                Child DIV
            </div>
            <p>
                Child PARAGRAPH
            </p>
        </p>
    </body>
</html>

HTML;

$crawler = new Crawler($html);
$crawlerFiltered = $crawler->filter('body > p');

$results = [];
$childResults = [];
for ($i=0; $i<count($crawlerFiltered); $i++) {
    $results[] = $crawlerFiltered->eq($i)->html();

    $children = $crawlerFiltered->eq($i)->children();
    if (count($children)) {
        for ($j=0; $j<count($children); $j++) {
            $childResults[] = $children->eq($j)->html();
        }
    }
}

echo 'Parent Nodes:' . PHP_EOL;
var_export($results);
echo PHP_EOL;
echo 'Child Nodes:' . PHP_EOL;
var_export($childResults);

我得到结果：

Parent Nodes:
array (
  0 => 'Hello World!',
  1 => 'Hello Crawler!',
  2 => 'OUTSIDE
            <span>
                Child SPAN
            </span>
            ',
  3 => '
                Child PARAGRAPH
            ',
)
Child Nodes:
array (
  0 => '
                Child SPAN
            ',
)

代表以下问题：

Child 结果：无 DIV 或 P（仅内嵌标签）
Parent 结果：PHARAGRAPH 没有标签，与 SPAN
Parent 结果：应该只包含第一个 p 因为第二个 p (PHARAGRAPH) 不 body 为 parent 但 p

你知道这是为什么吗？如何解决上述问题？

Answer 1

The documentation for this component 状态：

Note

The DomCrawler will attempt to automatically fix your HTML to match the official specification. For example, if you nest a <p> tag inside another <p> tag, it will be moved to be a sibling of the parent tag. This is expected and is part of the HTML5 spec.

使用内置 DomDocument classes. Most HTML parsers are designed to deal with "tag soup" 可能会更好，并且会尝试纠正感知到的问题。

Symfony Dom 爬虫缺少节点，行为不一致

Symfony Dom Crawler Missing Node, Inconsistent Behaviour

php

components

css-selectors

symfony

domcrawler