<?xml version="1.0" encoding="utf-8" ?><bookstore><book category="COOKING"><title lang="en">Everyday Italian</title><author>Giada De Laurentiis</author><year>2018</year><price>30.00</price></book><book category="CHILDREN"><title lang="en">Harry Potter</title><author>J K. Rowling</author><year>2021</year><price>29.99</price></book><book category="WEB"><title lang="en">Learning XML</title><author>Erik T. Ray</author><year>2022</year><price>39.95</price></book></bookstore>
1.查询
<?php//[需求]：将bookstore.xml的内容以表格的形式输出。//得到simplexmlelement工具//办法1, 利用布局方法, 把稳参数是data, 不能文件名// $data = file_get_contents('bookstore.xml');// $sxe = new SimpleXMLElement($data);//办法2, 利用普通的函数来得到工具$sxe = simplexml_load_file("bookstore.xml");$res = "<table width='600' border='1'>";$res .= "<tr><th>title</th><th>author</th><th>year</th><th>price</th></tr>";foreach($sxe->book as $book){$res .= "<tr>";$res .= "<td>{$book->title}</td>";$res .= "<td>{$book->author}</td>";$res .= "<td>{$book->year}</td>";$res .= "<td>{$book->price}</td>";$res .= "</tr>";}$res .= "</table>";echo $res?>
2.添加
<?php//[需求]：在bookstore中增加一本书$sxe = simplexml_load_file('bookstore.xml');//添加子元素$newbook = $sxe->addChild('book'); //把稳，此处的sxe便是根节点$newtitle = $newbook->addChild('title','天龙八部');$newbook->addChild('author','金庸');$newbook->addChild('year',1968);$newbook->addChild('price',59);//添加属性$newbook->addAttribute('category','武侠');$newtitle->addAttribute('lang','tw');//保存为新的xml$sxe->asXML('sxe_add_book.xml');?>
结果如下:
<book category="武侠"><title lang="tw">天龙八部</title><author>金庸</author><year>18968</year><price>59</price></book>
3.更新
<?php//[需求]：将所有的书本打2折$sxe = simplexml_load_file('bookstore.xml');foreach ($sxe->book as $book){ $book->price = 0.2;}// 指定保存文件$sxe->asXML('sxe_update_book.xml');?>
4.删除
<?php//[需求]：删除所有书本的year元素$sxe = simplexml_load_file('bookstore.xml');foreach ($sxe->book as $book){ unset($book->year);}// 指定保存文件$sxe->asXML('sxe_delete_book.xml');
把稳： unset() 销毁指定的变量, 数组元素, 工具均可以删除
