PHP配置数据库XML文件

<?php
$doc=new DOMDocument('1.0','utf-8');
//new一个dom对象
$doc->load("config.xml");
加载xml文件
$mysql=$doc->getElementsByTagName("mysql");
//获取xml为mysql的节点
$mysql1=$mysql->item();
//第一个
$servicer=$mysql1->getElementsByTagName("servicer")->item()->nodeValue;
//获取服务器地址
echo $servicer;
$root=$mysql1->getElementsByTagName("root")->item()->nodeValue;
//获取用户名
echo $root;
$pw=$mysql1->getElementsByTagName("pw")->item()->nodeValue;
//获取密码
echo $pw;
echo "<hr>";
$link=mysql_connect("$servicer","$root","$pw")or die('连接数据库失败');
mysql_select_db('laravelbook',$link) or die('失败');
$sql='select *from posts;';
$res=mysql_query($sql);
while($rows=mysql_fetch_row($res)){
    foreach($rows as $value)
    {echo $value;}
}

XML文件

<?xml version="1.0" encoding="utf-8"?>
<mysql_parameter>
    <mysql>
        <servicer>localhost</servicer>

        <root>root</root>

        <pw>ok</pw>
    </mysql>
</mysql_parameter>