<?php
define('DB_host', "localhost");
define('DB_user', "root");
define('DB_password',"root");
define('DB_name',"nav_database"); session_start(); if(!mysql_connect(DB_host,DB_user,DB_password) echo mysql_error();?>看看错在哪里.
define('DB_host', "localhost");
define('DB_user', "root");
define('DB_password',"root");
define('DB_name',"nav_database"); session_start(); if(!mysql_connect(DB_host,DB_user,DB_password) echo mysql_error();?>看看错在哪里.
改为
mysql_select_db(DB_name,$db);因为 DB_name 是自定义常量: define('DB_name',"nav_database");