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PHP编写和读取XML的方式有哪些

2019-09-17 10:02:26来源：爱站网阅读 ()

XML处理在开发中是非常常见的，XML有存储数据和数据交换等用途，我们在学习XML的知识时需要了解它是什么，做什么的这样才能更好的掌握。那么你知道PHP编写和读取XML的方式有哪些吗？

一.使用DOM生成和读取XML文件
实例一：

复制代码代码如下:

<?php

//Creates XML string and XML document using the DOM

$dom = new DomDocument('1.0');

//add root - <books>

$books = $dom->appendChild($dom->createElement_x_x ('books'));

//add <book> element to <books>

$book = $books->appendChild($dom->createElement_x_x ('book'));

//add <title> element to <book>

$title = $book->appendChild($dom->createElement_x_x ('title'));

//add <title> text node element to <title>

$title->appendChild($dom->createTextNode('Great American Novel'));

//generate xml

$dom->formatOutput = true; // set the formatOutput attribute of domDocument to true

//save XML as string or file

$test1 = $dom->saveXML(); // put string in test1

$dom -> save('test1.xml'); // save as file

?>

实例二：

复制代码代码如下:

$aa = "111";

$xmlstr = <<<XML

<?xml version='1.0'?>

<document>

<title>{$aa}</title>

<from>Joe</from>

<to>Jane</to>

<body>

I know that's the answer -- but what's the question?

</body>

</document>

XML;

$dom = new domDocument;

$dom->loadXML($xmlstr);

$test1 = $dom->saveXML();

$dom->save('test1.xml');

实例三：
test1.xml:

复制代码代码如下:

<?xml version="1.0"?>

<books>

<book>

<author>Jack Herrington</author>

<title>PHP Hacks</title>

<publisher>O'Reilly</publisher>

</book>

<book>

<author>Jack Herrington</author>

<title>Podcasting Hacks</title>

<publisher>O'Reilly</publisher>

</book>

</books>

example.php:

复制代码代码如下:

$doc = new DOMDocument();

$doc->load('test1.xml');

$books = $doc->getElementsByTagName("book");

foreach($books as $book){

$authors = $book->getElementsByTagName("author");

$author = $authors->item(0)->nodeValue;

$publishers = $book->getElementsByTagName( "publisher" );

$publisher = $publishers->item(0)->nodeValue;

$titles = $book->getElementsByTagName( "title" );

$title = $titles->item(0)->nodeValue;

echo "$title - $author - $publisher\n";

}

二.使用simple生成和读取xml文件
实例一：

复制代码代码如下:

<?

$xmlstr = <<<XML

<?xml version='1.0' standalone='yes'?>

<books>

<book>

<title>Great American Novel</title>

<characters>

<character>

<name>Cliff</name>

<desc>really great guy</desc>

</character>

<character>

<name>Lovely Woman</name>

<desc>matchless beauty</desc>

</character>

<character>

<name>Loyal Dog</name>

<desc>sleepy</desc>

</character>

</characters>

<plot>

Cliff meets Lovely Woman. Loyal Dog sleeps, but wakes up to bark

at mailman.

</plot>

<success type='bestseller'>4</success>

<success type='bookclubs'>9</success>

</book>

</books>

XML;

//提取节点内容

$xml = new SimpleXMLElement($xmlstr);

foreach ($xml->book[0]->success as $success) {

switch((string) $success['type']) { // Get attributes as element indices

case 'bestseller':

echo $success. ' months on bestseller list<br>';

break;

case 'bookclubs':

echo $success. ' bookclub listings';

break;

}

}

//修改文本节点内容

$xml = new SimpleXMLElement($xmlstr);

$xml->book[0]->characters->character[0]->name = 'Big Cliff';

echo $xml->asXML();

//添加子元素的文本节点

$xml = new SimpleXMLElement($xmlstr);

$character = $xml->book[0]->characters->addChild('character');

$character->addChild('name', 'Yellow Cat');

$character->addChild('desc', 'aloof');

$success = $xml->book[0]->addChild('success', '2');

$success->addAttribute('type', 'reprints');

echo $xml->asXML();

?>

实例二：

复制代码代码如下:

if (file_exists('test1.xml')) { //读取xml文件

$xml = simplexml_load_file('test1.xml');

var_dump(xml);

} else {

exit('Failed to open test1.xml.');

}

三.DOM和simple互操作
DOM导入simpleXML：

复制代码代码如下:

<?php

$sxe = simplexml_load_string('<books><book><title>Great American

Novel</title></book></books>');

if ($sxe === false) {

echo 'Error while parsing the document';

exit;

}

$dom_sxe = dom_import_simplexml($sxe);

if (!$dom_sxe) {

echo 'Error while converting XML';

exit;

}

$dom = new DOMDocument('1.0');

$dom_sxe = $dom->importNode($dom_sxe, true);

$dom_sxe = $dom->appendChild($dom_sxe);

$test2 = $dom->saveXML(); // put string in test2

$dom -> save('test2.xml'); // save as file

?>

simpleXML导入DOM：

复制代码代码如下:

<?php

$dom = new domDocument;

$dom->loadXML('<books><book><title>Great American

Novel</title></book></books>');

if (!$dom) {

echo 'Error while parsing the document';

exit;

}

$s = simplexml_import_dom($dom);

echo $s->book[0]->title; // Great American Novel

?>

PHP编写和读取XML的方式有哪些？以上介绍的就是关于XML的相关资料，小编把一些关键点以及PHP编写和读取XML的一些实例整理出来，方便大家以后使用。?

原文链接:https://js.aizhan.com/develop/php/8880.html
如有疑问请与原作者联系

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