xpath：选择中断标签之前和之后的文本节点

考虑以下因素：（混合<br> and <br/>)

text1
<br>
text2
<br/>
text3
<br/>
text4
<br>
text5

如何找到每个文本节点？

我正在考虑符合 br 标签之前或之后的条件的东西......但不确定是否<br> and <br/>在 xpath 中的处理方式不同。

DOM文档 http://php.net/manual/en/class.domdocument.php's 加载Html()方法适用于无效的 HTML 片段，因此您可以这样使用 DOMXPath：

<?php

$html = 'text1
<br>
text2
<br/>
text3
<br/>
text4
<br>
text5';

echo "<pre>" . htmlentities($html) . "</pre><br>\n";

$dom = new DOMDocument();
// loadHtml() needs mb_convert_encoding() to work well with UTF-8 encoding
$dom->loadHtml(mb_convert_encoding($html, 'HTML-ENTITIES', "UTF-8"));

$xpath = new DOMXPath($dom);

echo "Text nodes preceding br:";
foreach($xpath->query('//text()[(following::br)]') as $node)
{
    var_dump($node->wholeText);
}

echo "Text nodes following br:";
foreach($xpath->query('//text()[(preceding::br)]') as $node)
{
    var_dump($node->wholeText);
}

echo "Text nodes following OR preceding br:";
foreach($xpath->query('//text()[(following::br) or (preceding::br)]') as $node)
{
    var_dump($node->wholeText);
}