bookstore.xml
<?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>29.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2020</year>
<price>37.54</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2021</year>
<price>18.74</price>
</book>
</bookstore>删除第三本书的year元素节点
<?php
$dom = new DOMDocument('1.0','utf-8');
$dom->load("bookstore.xml");
//找到year元素节点
$year = $dom->getElementsByTagName('year')->item(2);
$year->parentNode->removeChild($year);
//保存
$dom->save('delete_bookstore.xml');
?>删除所有书籍的year元素节点。
<?php
$dom = new DOMDocument('1.0','utf-8');
$dom->load("bookstore.xml");
//找到所有的year元素节点
$years = $dom->getElementsByTagName('year');
/*
//这么删除是有问题的
foreach ($years as $year){
$year->parentNode->removeChild($year);
}
*/
//第一步, 先保存
$temp = array();
foreach ($years as $year){
$temp[] = $year;
}
//第二步, 再删除
foreach ($temp as $v){
$v->parentNode->removeChild($v);
}
//保存
$dom->save('delete2_bookstore.xml');
?>注意：切记, 不要在删除的时候, 再去遍历这个节点, 节点的结构已经发生了变化, 导致遍历的时候会出现差错。
解决办法, 就是将这两个操作分开处理。先得打所有的这些节点, 将其保存到一个临时变量中, 然后再进行删除。