Php利用simpleXML对xml操作

实现代码：

<?php
echo '<meta http-equiv="content-type" content="text/html; charset=utf-8">';
//读出xml文档
$xml = file_get_contents('books.xml');
$simple = new SimpleXMLElement($xml);
//1.查询
echo "<table border='1'>";
foreach ($simple->book as $book){
$attr = $book->attributes();//获取节点的属性
echo "<tr>";
echo "<td>" . $book->name . "</td>";
echo "<td>" . $attr['type'] . "</td>";
echo "</tr>";
}
echo "</table>";

//添加
/*
$book = $simple->addChild('book');
$book->addChild('name', 'C++');
$book->addAttribute('type', '动态语言');
$simple->saveXML('books.xml');
*/

/*
//更新
foreach ($simple->book as $book){
$book->name .= "-dancheng";
}
$simple->saveXML('books.xml');
*/

//删除
for($i = count($simple->book) - 1; $i >= 0; $i--){
$currenbook = $simple->book[$i];
$attr = $currenbook->attributes();
if($attr['type'] == '动态语言'){
unset($simple->book[$i]);
}
$simple->saveXML('books.xml');
}