PHP DOM 解析器移动结束 Div 标记

Question

这是我的代码：

$myHtml = '
<div class="div-class">
    <p>text</p>

    <p><a href="#">text</a></p>
</div>

<ul class="some-class">
    <li><a href="#" target="_blank" title="something something"><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src=""></a>
    </li>
</ul>
';

$doc = new \DOMDocument();
$doc->loadHTML($myHtml, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new \DOMXPath($doc);
$anchors = $xpath->query("//a[@title='something something']");
$list = $xpath->query("//ul[@class='some-class']")[0];
foreach ($anchors as $a) {
    $list->removeChild($a->parentNode);
}

var_dump($doc->saveHTML());

本质上，我试图删除一个包含标题为 'something something' 的锚标记的列表项。但是，当我在应用更改后保存 html 时，列表会移动到 div 标记内。为什么会这样？谢谢

Answer 1

loadHTML() 尝试更正句法，它不喜欢 ul 元素没有父元素，因此将它移到 div 中。如果将其全部包裹在 body 标记周围，它将正常工作。

loadHTML() 实际上应该在必要时自动为您进行包装，但是您设置了 LIBXML_HTML_NOIMPLIED 标志，这会禁用它。

<?php
$myHtml = '
<html>
<body>
<div class="div-class">
    <p>text</p>

    <p><a href="#">text</a></p>
</div>

<ul class="some-class">
    <li><a href="#" target="_blank" title="something something"><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src=""></a>
    </li>
</ul>
</body>
</html>
';

$doc = new \DOMDocument();
$doc->loadHTML($myHtml, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new \DOMXPath($doc);
$anchors = $xpath->query("//a[@title='something something']");
$list = $xpath->query("//ul[@class='some-class']")[0];
foreach ($anchors as $a) {
    $list->removeChild($a->parentNode);
}

var_dump($doc->saveHTML());

Demo

或者，没有 LIBXML_HTML_NOIMPLIED 标志：

<?php
$myHtml = '
<div class="div-class">
    <p>text</p>

    <p><a href="#">text</a></p>
</div>

<ul class="some-class">
    <li><a href="#" target="_blank" title="something something"><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src="" alt=""></a>
    </li>
    <li><a href="" target="_blank" title=""><img src=""></a>
    </li>
</ul>
';

$doc = new \DOMDocument();
$doc->loadHTML($myHtml, LIBXML_HTML_NODEFDTD);
var_dump (libxml_get_errors());
$xpath = new \DOMXPath($doc);
$anchors = $xpath->query("//a[@title='something something']");
$list = $xpath->query("//ul[@class='some-class']")[0];
foreach ($anchors as $a) {
    $list->removeChild($a->parentNode);
}

var_dump($doc->saveHTML());

Demo

PHP DOM 解析器移动结束 Div 标记

PHP DOM Parser Moving Closing Div Tag

html

php

string

domparser