php操作XML、读取数据和写入数据的实现代码

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<?xml version="1.0" encoding="utf-8"?>
  
<vip>
 <id>23</id>
 <username>开心的路飞</username>
 <sex>男</sex>
 <face>face/43.jpg</face>
 <email>123@qq.com</email>
 <qq>1212121212</qq>
</vip>

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/*
 * _get_xml 获取的XML文件
* @access public 表示函数对外公开
* @param $_xmlfile xml文件
* $_html 从XML中取出的数据数组
* */
function _get_xml($_xmlfile){
  $_html = array();
  if(file_exists($_xmlfile)){
    $_xml = file_get_contents($_xmlfile);
    preg_match_all('/<vip>(.*)</vip>/', $_xml,$_dom);   
    foreach($_dom[1] as $_value){
      preg_match_all('/<id>(.*)</id>/', $_value,$_id);
      preg_match_all('/<username>(.*)</username>/', $_value,$_username);
      preg_match_all('/<sex>(.*)</sex>/', $_value,$_sex);
      preg_match_all('/<face>(.*)</face>/', $_value,$_face);
      preg_match_all('/<email>(.*)</email>/', $_value,$_email);
      preg_match_all('/<qq>(.*)</qq>/', $_value,$_qq);
      $_html['id'] = $_id[1][0];
      $_html['username'] = $_username[1][0];
      $_html['sex'] = $_sex[1][0];
      $_html['face'] = $_face[1][0];
      $_html['email'] = $_email[1][0];
      $_html['qq'] = $_qq[1][0];
    }
  }else{
    _alert_back("文件不存在");
  }
  return $_html;
}

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/*
 * _set_xml将信息写入XML文件
* @access public 表示函数对外公开
* @param $_xmlfile xml文件
* @param $_clean 要写入的信息的数组
* */
function _set_xml($_xmlfile,$_clean){
  $_fp = @fopen('newuser.xml','w');
  if(!$_fp){
    exit('系统错误，文件不存在！');
  }
  flock($_fp,LOCK_EX);
  $_string = "<?xml version="1.0" encoding="utf-8"?>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "<vip>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<id>{$_clean['id']}</id>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<username>{$_clean['username']}</username>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<sex>{$_clean['sex']}</sex>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<face>{$_clean['face']}</face>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<email>{$_clean['email']}</email>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "t<qq>{$_clean['url']}</qq>rt";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "</vip>";
  fwrite($_fp, $_string,strlen($_string));
  flock($_fp,LOCK_UN);
  fclose($_fp);
}