<?php
//定义DATABASE常量，此时DATABASE常量名大小写敏感
define("DATABASE","student");

//定义USER_NAME常量，此时USER_NAME大小写敏感
define("USER_NAME","root",FALSE);

//定义PASSWORD常量，此时PASSWORD大小写不敏感
define("PASSWORD","root",TRUE);

echo DATABASE;//输出：student
echo "<br/>";

echo USER_NAME;//输出：root
echo "<br/>";

echo password;//输出：root

?>
