php引用文件方式
引用文件的方法有2种：
1、require
require("conn.php"); 一般放在页面的第一行，做为该页执行的一部分，首先执行require内的conn.php 然后再执行下面的代码
2、include
include("header.php");当程序到达这里的时候才会执行include的 header.php
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