php+xml实现在线英文词典之添加词条的方法

<?xml version="1.0" encoding="utf-8"?>
<words>
<word>
?<en>boy</en>
?<ch>男孩</ch>
</word>
<word>
?<en>girl</en>
?<ch>女孩</ch>
</word>
<word>
?<en>teacher</en>
?<ch>老师</ch>
</word>
<word>
?<en>beauty</en>
?<ch>美女</ch>
</word>
</words>

<h2 style="color:green">在线英汉词典</h2>
<h4>查询英文单词</h4>
<form action="xmlprocess.php" method="post">
请输入英文单词：<input type="text" name="enword" />
<input type="submit" value="查询" name="sub" />
</form>
<h4>添加英文单词</h4>
<form action="xmlprocess.php" method="post">
英文单词：<input type="text" name="en_word" /><br />
中文意思：<input type="text" name="ch_word" />
<input type="submit" value="添加" name="add">
</form>

<?php
//创建xml对象
$xmldoc = new DOMDocument();
$xmldoc->load("words.xml");
//查询
if(!empty($_POST['sub'])){
?$en_word = $_POST['enword'];
?$word = $xmldoc->getElementsByTagName("en");
?for($i=0;$i<$word->length;$i++){
? if($en_word==$word->item($i)->nodeValue){
?? $cn_word = $xmldoc->getElementsByTagName("ch")->item($i)->nodeValue;
?? break;
? }else{
?? $cn_word = "找不到你所输入的单词";
? }
?}
?echo $cn_word;
}
//增加词条
if(!empty($_POST['add'])){
?$en_word = $_POST['en_word'];
?$ch_word = $_POST['ch_word'];
?//获取根节点
?$words = $xmldoc->getElementsByTagName("words")->item(0);
?//增加元素,并添加内容
?$new_word = $xmldoc->createElement("word");
?$new_word_en = $xmldoc->createElement("en");
?$new_word_en->nodeValue = $en_word;
?$new_word_ch = $xmldoc->createElement("ch");
?$new_word_ch->nodeValue = $ch_word;
?//元素之间挂载,意思是将子元素与父元素相连
?$new_word->appendChild($new_word_en);
?$new_word->appendChild($new_word_ch);
?$words->appendChild($new_word);
?//保存
?$xmldoc->save("words.xml");
}
?>