How to manipulate XML in PHP?

With the continuous development of informatization, XML has become a common data transmission format. In web development, PHP is a commonly used web programming language. So, how to manipulate XML in PHP? This article will take you through the commonly used XML operations in PHP.

1. Introduction to XML

XML (eXtensible Markup Language) is a markup language used to mark electronic documents to have structured information. XML is similar to HTML, but more flexible than HTML and allows custom tags. XML has the following characteristics:

1. Extensibility: tags and attributes can be customized to better meet specific application needs.
2. Versatility: Any development language can process XML documents.
3. Readability: XML documents are easy to read and edit in a text editor.

2. PHP processing XML method

1. DOM method

DOM (Document Object Model) method is a way to convert XML documents into How object trees are handled. In PHP, you can use DOM to create, modify and query XML documents.

Basic syntax for creating DOM objects:

$dom = new DOMDocument();

Basic syntax for loading XML documents:

$dom->load('xml文件路径');

Basic syntax for creating XML documents:

$dom = new DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;          //格式化输出
$root = $dom->createElement('root');     //创建根标签
$dom->appendChild($root);
$book = $dom->createElement('book');     //创建子标签
$root->appendChild($book);
$name = $dom->createElement('name', 'PHP从入门到精通');    //创建属性和值
$book->appendChild($name);

In DOM In this way, it is also very convenient to modify, insert and delete nodes in XML documents. Taking modification as an example, the basic syntax is as follows:

$dom = new DOMDocument();
$dom->load('xml文件路径');      //加载XML文档
$node = $dom->getElementsByTagName('节点名称')->item(0);      //获取要修改的节点
$node->nodeValue = '新值';      //修改节点的值

2. SimpleXML method

SimpleXML method is a simple and easy-to-use XML data processing method. If the structure of the XML file is relatively simple, SimpleXML can be used to implement read and write operations. SimpleXML method converts an XML file into a PHP object, and each node is an attribute of the object.

Basic syntax for loading XML files:

$xml = simplexml_load_file('xml文件路径');

Basic syntax for creating XML documents:

$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><root></root>');
$book = $xml->addChild('book');       //添加子节点
$book->addChild('name', 'PHP从入门到精通');      //添加属性和值

In SimpleXML mode, modifying the value of a node and deleting a node can also be achieved . Taking modification as an example, the basic syntax is as follows:

$xml = simplexml_load_file('xml文件路径');
$xml->节点名称 = '新值';     //修改节点的值

3. Summary

The above is the commonly used XML processing method in PHP. The DOM method is suitable for processing complex XML documents, while the SimpleXML method is suitable for processing simple XML documents. Choosing the appropriate XML processing method according to actual needs can improve development efficiency.

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