PHP DOMDocument 提取元素并创建新文档

Question

HTML:

<head>
    <link rel="preload" href="/_next/list.js" as="script">
    <!-- ... other link elemens -->
    <style data-styled="" data-styled-version="4.2.0"></style>
</head>

任务：

从 head 中提取所有 link 和样式标签，并使用主机路径更新 href 属性。
创建我们可以在主 html 模板中输出的新 html 字符串元素（html 的一部分）。

PHP:

$dom = new DOMDocument();
$dom->loadHTML($stringBody);
$xpath = new DOMXPath($dom);
$headItems = $xpath->query("//head/link[@rel='preload' or @rel='stylesheet'] | //head/style");

// now I want to create html string with updated attributes, but I'm lost here..
$head = new DOMDocument();
foreach ($headItems as $headNode) {
    $headNode->setAttribute('href', $host . $headNode->getAttribute('href'));
}
$links = $head->saveHTML($headNode);
echo $links; // echo html link tags

Answer 1

试试这个：

<?php

$host = 'example.com';

$stringBody = '<head>
    <link rel="preload" href="/_next/list.js" as="script">
    <!-- ... other link elemens -->
    <style data-styled="" data-styled-version="4.2.0"></style>
</head>';

$dom = new DOMDocument();
$dom->loadHTML($stringBody);
$xpath = new DOMXPath($dom);
$headItems = $xpath->query("//head/link[@rel='preload' or @rel='stylesheet'] | //head/style");

$links = [];

foreach ($headItems as $headNode) {
    if ($headNode->hasAttribute('href')) {
        $headNode->setAttribute('href', $host . $headNode->getAttribute('href'));
    }
    $links[] = $headNode->ownerDocument->saveHTML($headNode);
}

print_r($links);

输出

Array
(
    [0] => <link rel="preload" href="example.com/_next/list.js" as="script">
    [1] => <style data-styled="" data-styled-version="4.2.0"></style>
)

PHP DOMDocument 提取元素并创建新文档

PHP DOMDocument extract elements and create new document

php

xpath

domdocument