SimpleXML对XML的增删改查

<?php
header("Content-Type:text/html;charset=utf-8");
//simpleXML解析XML文件
//注意：参数是我们要解析的XML文件的内容，不是文件名
$xml_cont = file_get_contents('bookshelf.xml');
$sxe = new SimpleXMLElement($xml_cont);
$books = $sxe->book;
//通过元素名找
//$books = $sxe->book;
//找所以的author
/*$authors = $sxe->book->author;
foreach($books as $book)
{
    echo $book->author;
}*/

//获得所有的title和author
/*
$books = $sxe ->book;
foreach($books as $book)
{
    echo $book->author;
    echo $book->title;
}
*/

//增加一个节点：
//我们可以把$sxe看作是文档的根节点
//$new_book = $sxe->addChild('book');
//在刚创建的book节点上增加一个title 内容是侠客行
//$new_book->addChild('title','侠客行');
//保存
//删除节点
//$book = $sxe->book[4];
//unset($book);
$author = $sxe->book[3]->author = '金庸';
$sxe->asXML('book3.xml');
?>