<?xml version="1.0"?>
<toppings>
<item price="4">pepperoni</item>
</toppings>
添加CDATA模块和过程向导
虽然不经常使用CDATA模块和过程向导，但是通过调用DOM文档对象的createCDATASection()和createProcessingInstruction()方法， PHP API 也能很好地支持CDATA和过程向导，请见程序清单E。
程序清单 E
复制代码 代码如下:
<?php
// create doctype
// create doctype
$dom = new DOMDocument("1.0");
// display document in browser as plain text
// for readability purposes
header("Content-Type: text/plain");
// create root element
$root = $dom->createElement("toppings");
$dom->appendChild($root);
// create child element
$item = $dom->createElement("item");
$root->appendChild($item);
// create text node
$text = $dom->createTextNode("pepperoni");
$item->appendChild($text);
// create attribute node
$price = $dom->createAttribute("price");
$item->appendChild($price);
// create attribute value node
$priceValue = $dom->createTextNode("4");
$price->appendChild($priceValue);
// create CDATA section
$cdata = $dom->createCDATASection(" Customer requests that pizza be sliced into 16 square pieces ");
$root->appendChild($cdata);
// create PI
$pi = $dom->createProcessingInstruction("pizza", "bake()");
$root->appendChild($pi);
// save and display tree
echo $dom->saveXML();
?>
输出如下所示：
复制代码 代码如下:
<?xml version="1.0"?>
<toppings>
<item price="4">pepperoni</item>
<![CDATA[
Customer requests that pizza be sliced into 16 square pieces
]]>
<?pizza bake()?>
</toppings>
保存结果
一旦已经实现你的目标，就可以将结果保存在一个文件或存储于PHP的变量。通过调用带有文件名的save()方法可以将结果保存在文件中，而通过调用saveXML()方法可存储于PHP的变量。请参考以下实例(程序清单F)：
程序清单 F
复制代码 代码如下:
<?php
// create doctype
$dom = new DOMDocument("1.0");
// create root element
$root = $dom->createElement("toppings");
$dom->appendChild($root);
$dom->formatOutput=true;
// create child element
$item = $dom->createElement("item");
$root->appendChild($item);
// create text node
$text = $dom->createTextNode("pepperoni");
$item->appendChild($text);
// create attribute node
$price = $dom->createAttribute("price");
$item->appendChild($price);
// create attribute value node
$priceValue = $dom->createTextNode("4");
$price->appendChild($priceValue);
// create CDATA section
$cdata = $dom->createCDATASection(" Customer requests that pizza be
sliced into 16 square pieces ");
$root->appendChild($cdata);
// create PI
$pi = $dom->createProcessingInstruction("pizza", "bake()");
$root->appendChild($pi);
// save tree to file
$dom->save("order.xml");
// save tree to string
$order = $dom->save("order.xml");
?>
下面是实际的例子，大家可以测试下。
xml.php(生成xml)
复制代码 代码如下:
<?
$conn = mysql_connect('localhost', 'root', '123456') or die('Could not connect: ' . mysql_error());
mysql_select_db('vdigital', $conn) or die ('Can\'t use database : ' . mysql_error());
$str = "SELECT id,username FROM `admin` GROUP BY `id` ORDER BY `id` ASC";
$result = mysql_query($str) or die("Invalid query: " . mysql_error());
if($result)
{
$xmlDoc = new DOMDocument();
if(!file_exists("01.xml")){
$xmlstr = "<?xml version='1.0' encoding='utf-8' ?><message></message>";
$xmlDoc->loadXML($xmlstr);
$xmlDoc->save("01.xml");
}
else { $xmlDoc->load("01.xml");}
$Root = $xmlDoc->documentElement;
while ($arr = mysql_fetch_array($result)){
$node1 = $xmlDoc->createElement("id");
$text = $xmlDoc->createTextNode(iconv("GB2312","UTF-8",$arr["id"]));
$node1->appendChild($text);
$node2 = $xmlDoc->createElement("name");
$text2 = $xmlDoc->createTextNode(iconv("GB2312","UTF-8",$arr["username"]));
$node2->appendChild($text2);
$Root->appendChild($node1);
$Root->appendChild($node2);
$xmlDoc->save("01.xml");
}
}
mysql_close($conn);
?>
test.php(应用测试)
复制代码 代码如下: