php操作XML、读取数据和写入数据的实现代码

xml文件

<?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>

php解析XML获取标签中的值

/*
 * _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;
}

php向XML文件中写入数据

/*
 * _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);
  $_string = "<?xml version="1.0" encoding="utf-8"?>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "<vip>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<id>{$_clean["id"]}</id>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<username>{$_clean["username"]}</username>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<sex>{$_clean["sex"]}</sex>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<face>{$_clean["face"]}</face>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<email>{$_clean["email"]}</email>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "	<qq>{$_clean["url"]}</qq>
	";
  fwrite($_fp, $_string,strlen($_string));
  $_string = "</vip>";
  fwrite($_fp, $_string,strlen($_string));
  flock($_fp,LOCK_UN);
  fclose($_fp);
}