php操作xml

<?php
$xml=file_get_contents("c.xml");
$simple=new SimpleXMLElement($xml);
//var_dump($simple);
//1查询
echo "<table border='1'>";
foreach ($simple->book as $book)
{
$attr=$book->attributes();//获取节点属性

echo "<tr>";
echo "<td>".$book->name."</td>";
echo "<td>".$book->price."</td>";
echo "<td>".$attr['type']."</td>";
echo "</tr>";
}
echo "</table>";

//2添加
$book=$simple->addChild('book');
$book->addChild('name',"你说是什么");
$book->addChild('price',"111");
$book->addAttribute('type',"添加语言");
$simple->saveXML("c.xml");

//3替换

foreach ($simple->book as $book)
{
$book->name.="出版设";
}
//可以直接改
//$simple->book[2]->name="i";
$simple->saveXML("c.xml");

//4删除
for ($i=count($simple->book)-1;$i>=0;$i--)
{
$currentbook=$simple->book[$i];
$attr=$currentbook->attributes();
if($attr['type']=='添加语言'){
unset($simple->book[$i]);
}
}
$simple->saveXML("c.xml");

?>

<?xml version="1.0" encoding="utf-8"?>
<books>
<book type="动态语言">
<name>中文版</name>
<price>21</price>
</book>
<book type="不是语言">
<name>中文版</name>
<price>21</price>
</book>
<book type="就态语言">
<name>中文版</name>
<price>21</price>
</book>
<book type="动态语言">
<name>中文版</name>
<price>21</price>
</book>
</books>