以下為引用的內(nèi)容：
messages.xml
========================================================
<?xml version="1.0" ?>
<!--Sample XML document -->
<SystemMessage>
<MessageTitle>System Down for Maintenance</MessageTitle>
<MessageBody>Going down for maintenance soon!</MessageBody>
<MessageAuthor>
<MessageAuthorName>Joe SystemGod</MessageAuthorName>
<MessageAuthorEmail>systemgod@someserver.com
</MessageAuthorEmail>
</MessageAuthor>
<MessageDate>March 4, 2004</MessageDate>
<MessageNumber>10</MessageNumber>
</SystemMessage>
======================================================== |
xml 是一種創(chuàng)建元數(shù)據(jù)的語言，元數(shù)據(jù)是描述其它數(shù)據(jù)的數(shù)據(jù)，PHP中的XML處理是基于LIBXML2的，安裝時默認開啟。
可以通過phpinfo()函數(shù)查看是否開啟了XML處理模塊，DOM，LIBXML，SAMPLEXML。
首先，通過samplexml_load_file函數(shù)把xml文件加載到一個對象中，samplexml_load_file可以用戶遠程文件。
例如：
$xml = samplexml_load_file("messages.xml"); // 本地文件系統(tǒng),當前目錄
$xml = samplexml_load_file("http://www.xml.org.cn/messages.xml"); // 遠程web服務器
用 var_dump($xml) 和 print_r($xml) 分別輸出其結(jié)構(gòu).var_dump給出了變量的類型和長度,而print_r可讀性更強輸出對象中的所有元素名稱和它的值。
echo $xml->MessageTitle; //輸出消息的標題
echo $xml->MessageBody; // 輸出消息體
echo $xml->MessageAuthor; //消息的作者
echo $xml->MessageDate; // 消息產(chǎn)生的日期
echo $xml->MessageNumber; // 消息代碼
===================================================
另外，還有一個函數(shù)，可以把XML字符串加載到一個simplexml對象中取。
以下為引用的內(nèi)容：
$channel =<<<_XML_
<channel>
<title>What's For Dinner</title>
<link>http://menu.example.com/</link>
<description>These are your choices of what to eat tonight. </description>
</channel>
_XML_; $xml = simplexml_load_string($channel);
=================================================== rss.xml =============================================
<?xml version="1.0" encoding="utf-8"?>
<rss version="0.91">
<channel>
<title>What's For Dinner</title>
<link>http://menu.example.com/</link>
<description>These are your choices of what to eat tonight.</description>
<item>
<title>Braised Sea Cucumber</title>
<link>http://menu.example.com/dishes.php?dish=cuke</link>
<description>Gentle flavors of the sea that nourish and refresh you. </description>
</item>
<item>
<title>Baked Giblets with Salt</title>
<link>http://menu.example.com/dishes.php?dish=giblets</link>
<description>Rich giblet flavor infused with salt and spice. </description>
</item>
<item>
<title>Abalone with Marrow and Duck Feet</title>
<link>http://menu.example.com/dishes.php?dish=abalone</link>
<description>There's no mistaking the special pleasure of abalone. </description>
</item>
</channel>
</rss>
===================================================== |
1、訪問具有相同元素名稱的節(jié)點
2、通過foreach循環(huán)所有相同元素名稱的子節(jié)點
以下為引用的內(nèi)容：
foreach($xml->channel->item as $key=>$value)
{
print "Title: " . $item->title . "/n";
} |
3、輸出整個文檔
echo $xml->asXML();
4、把節(jié)點作為字符串輸出
echo $xml->channel->item[0]->asXML();
這將輸出文本
以下為引用的內(nèi)容：
<item>
<title>Braised Sea Cucumber</title>
<link>http://menu.example.com/dishes.php?dish=cuke</link>
<description>Gentle flavors of the sea that nourish and refresh you. </description>
</item> |
帶文件名參數(shù)的asXML將會把原本輸出的內(nèi)容保存為一個文件
$xml->channel->item[0]->asXML("item[0].xml");
完整的代碼：
以下為引用的內(nèi)容：
rss.xml
=====
<?xml version="1.0" encoding="utf-8"?>
<rss version="0.91">
<channel>
<title>What's For Dinner</title>
<link>http://menu.example.com/</link>
<description>These are your choices of what to eat tonight.</description>
<item>
<title>Braised Sea Cucumber</title>
<link>http://menu.example.com/dishes.php?dish=cuke</link>
<description>Gentle flavors of the sea that nourish and refresh you. </description>
</item>
<item>
<title>Baked Giblets with Salt</title>
<link>http://menu.example.com/dishes.php?dish=giblets</link>
<description>Rich giblet flavor infused with salt and spice. </description>
</item>
<item>
<title>Abalone with Marrow and Duck Feet</title>
<link>http://menu.example.com/dishes.php?dish=abalone</link>
<description>There's no mistaking the special pleasure of abalone. </description>
</item>
</channel>
</rss> rss.php
======
<?php
$xml = simplexml_load_file("rss.xml"); echo "<h3>".$xml->channel->title."</h3><br>";
echo "<ul>";
echo "<li>Title:".$xml->channel->item[0]->title."</li>";
echo "<li>Title:".$xml->channel->item[1]->title."</li>";
echo "<li>Title:".$xml->channel->item[2]->title."</li>";
echo "</ul>";
print "Title: " . $xml->channel->item[0]->title . "/n<br>";
print "Title: " . $xml->channel->item[1]->title . "/n<br>";
print "Title: " . $xml->channel->item[2]->title . "/n<br>";
echo "<hr>"; foreach ($xml->channel->item[0] as $element_name => $content) {
print "The $element_name is $content/n<br>";
} echo "<hr>";
print_r($xml);
echo $xml->channel->item[0]->asXML();
?> |
任何XML文本在輸出前最好用 htmlentiteis() 函數(shù)編碼后再輸出，否這可能出現(xiàn)問題
