用PHP5的SimpleXML解析XML文档

2009-12-21 17:45| 发布者: admin| 查看: 50| 评论: 0|原作者: 云忆

messages.xml
========================================================

　　　 System Down for Maintenance
　　　　Going down for maintenance soon!
　　　　
　　 Joe SystemGod
　　 systemgod@someserver.com

　　　　
　　　　March 4, 2004
　　 10

========================================================
xml 是一种创建元数据的语言,元数据是描述其它数据的数据,PHP中的XML处理是基于LIBXML2的，安装时默认开启。
可以通过phpinfo()函数查看是否开启了XML处理模块,DOM,LIBXML,SAMPLEXML。
首先,通过samplexml_load_file函数把xml文件加载到一个对象中,samplexml_load_file可以用户远程文件.
例如:
$xml = samplexml_load_file("messages.xml"); // 本地文件系统,当前目录
$xml = samplexml_load_file("http://www.xml.org.cn/messages.xml"); // 远程web服务器
用 var_dump($xml) 和 print_r($xml) 分别输出其结构.var_dump给出了变量的类型和长度,而print_r可读性更强
输出对象中的所有元素名称和它的值.

echo $xml->MessageTitle;　//输出消息的标题
echo $xml->MessageBody; // 输出消息体
echo $xml->MessageAuthor;　//消息的作者
echo $xml->MessageDate;　　// 消息产生的日期
echo $xml->MessageNumber;　　// 消息代码
===================================================
另外,还有一个函数,可以把XML字符串加载到一个simplexml对象中取
$channel =<<<_XML_

What's For Dinner
http://menu.example.com/
These are your choices of what to eat tonight.

_XML_;
$xml = simplexml_load_string($channel);
===================================================

rss.xml
=============================================

　What's For Dinner
　http://menu.example.com/
　These are your choices of what to eat tonight.
　
　 Braised Sea Cucumber
　 http://menu.example.com/dishes.php?dish=cuke
　 Gentle flavors of the sea that nourish and refresh you.
　
　
　 Baked Giblets with Salt
　 http://menu.example.com/dishes.php?dish=giblets
　 Rich giblet flavor infused with salt and spice.
　
　
　 Abalone with Marrow and Duck Feet
　 http://menu.example.com/dishes.php?dish=abalone
　 There's no mistaking the special pleasure of abalone.
　

=====================================================
1.访问具有相同元素名称的节点
2.通过foreach循环所有相同元素名称的子节点
foreach($xml->channel->item as $key=>$value)
{
print "Title: " . $item->title . "\n";
}
3.输出整个文档
echo $xml->asXML();
4.把节点作为字符串输出
echo $xml->channel->item[0]->asXML();
这将输出文本

Braised Sea Cucumber
http://menu.example.com/dishes.php?dish=cuke
Gentle flavors of the sea that nourish and refresh you.

带文件名参数的asXML将会把原本输出的内容保存为一个文件
$xml->channel->item[0]->asXML("item[0].xml");

完整的代码:
rss.xml
=====

　What's For Dinner
　http://menu.example.com/
　These are your choices of what to eat tonight.
　
　 Braised Sea Cucumber
　 http://menu.example.com/dishes.php?dish=cuke
　 Gentle flavors of the sea that nourish and refresh you.
　
　
　 Baked Giblets with Salt
　 http://menu.example.com/dishes.php?dish=giblets
　 Rich giblet flavor infused with salt and spice.
　
　
　 Abalone with Marrow and Duck Feet
　 http://menu.example.com/dishes.php?dish=abalone
　 There's no mistaking the special pleasure of abalone.
　

rss.php
======
$xml = simplexml_load_file("rss.xml");
echo "

".$xml->channel->title."

";
echo "

Title:".$xml->channel->item[0]->title."

Title:".$xml->channel->item[1]->title."

Title:".$xml->channel->item[2]->title."

";
print "Title: " . $xml->channel->item[0]->title . "\n
";
print "Title: " . $xml->channel->item[1]->title . "\n
";
print "Title: " . $xml->channel->item[2]->title . "\n
";
echo "

";
foreach ($xml->channel->item[0] as $element_name => $content) {
　　print "The $element_name is $content\n
";
}
echo "

";
print_r($xml);
echo $xml->channel->item[0]->asXML();
?>
任何XML文本在输出前最好用 htmlentiteis() 函数编码后再输出,否这可能出现问题

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用PHP5的SimpleXML解析XML文档

".$xml->channel->title."

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