<?php//[需求]：删除所有书籍的year节点$sxe = simplexml_load_file("bookstore.xml");foreach ($sxe->book as $book) {unset($book->year);//删除year节点。删除变量用unset()。} $sxe->asXML('sxe_delete_book.xml');

<?xml version="1.0" encoding="utf-8" ?><bookstore><book category="COOKING"><title>Everyday Italian</title><author>Giada De Laurentiis</author><year>2005</year><price>30.00</price></book><book category="CHILDREN"><title>Harry Potter</title><author>J K. Rowling</author><year>2005</year><price>29.99</price></book><book category="WEB"><title>Learning XML</title><author>Erik T. Ray</author><year>2003</year><price>39.95</price></book></bookstore>