<?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>