php+xml实现在线英文词典查询的方法

<?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>在线英汉词典</h2>
<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>

<?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;
?>