php操作XML，读取数据和写入数据的方法

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>[email protected]</email>
		
	<qq>1212121212</qq>
	
</vip>

/*
 * _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;
}

/*
 * _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);
    $_string = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "<vip>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<id>{$_clean['id']}</id>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<username>{$_clean['username']}</username>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<sex>{$_clean['sex']}</sex>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<face>{$_clean['face']}</face>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<email>{$_clean['email']}</email>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "\t<qq>{$_clean['url']}</qq>\r\t";
    fwrite($_fp, $_string,strlen($_string));
    $_string = "</vip>";
    fwrite($_fp, $_string,strlen($_string));
    flock($_fp,LOCK_UN);
    fclose($_fp);
}

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