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PHP8的XML操作是指使用PHP编程语言处理和解析XML（可扩展标记语言）文档。具体来说，这包括创建、读取、修改和输出XML文档以及与XML相关的各种操作。

以下是一些常用的PHP8 XML操作示例：

1. 创建一个新的XML文档

php
$doc = new DOMDocument();
$root = $doc->createElement("books");
$doc->appendChild($root);
$book = $doc->createElement("book");
$title = $doc->createElement("title", "PHP for Beginners");
$book->appendChild($title);
$author = $doc->createElement("author", "John Doe");
$book->appendChild($author);
$root->appendChild($book);
echo $doc->saveXML();


2. 从现有的XML文件中读取数据

php
$xml = simplexml_load_file("books.xml");
foreach($xml->book as $book) {
echo "Title: " . $book->title . ", Author: " . $book->author . "<br>";
}


3. 修改现有的XML文档

php
$xml = new DOMDocument();
$xml->load("books.xml");
$books = $xml->getElementsByTagName("book");
foreach ($books as $book) {
$titles = $book->getElementsByTagName("title");
$title = $titles->item(0)->nodeValue;
$new_title = $xml->createElement("title", "New Title");
$book->replaceChild($new_title, $titles->item(0));
}
$xml->save("books.xml");


4. 将XML文档输出为字符串

php
$xml = new SimpleXMLElement('<books></books>');
$book = $xml->addChild('book');
$book->addChild('title', 'PHP for Beginners');
$book->addChild('author', 'John Doe');
echo $xml->asXML();