Question

PHP错误提示怎么解决

Notice: Use of undefined constant root - assumed 'root' in C:\Ftp\Users\guanli2\Webroot\test.php on line 83

<?php
$value=$_POST['select'];
$name=$_POST['name'];
$passwd=$_POST['passwd'];

require_once 'config.php'; //引入配置文件
$db=mysql_connect($db_host,$db_user,$db_password);
mysql_select_db("message",$db);
$result=mysql_query("select * from student",$db);
$row=mysql_fetch_array($result);
....
if ($name==root and $passwd==root and $value==3)
{
header ("location: select2.html");
exit;
}

else {
//header ("location: index.html");
}

Answer 1

root 改成 'root'

Answer 2

字符串应该加引号，否则php会抛出一个notice
改为 $name==“root” and $passwd==“root” and $value==3
当然，你可以error_reporting(E_WARNING);来关闭这个这个提示

Answer 3

error_reporting(0);

Answer 4

if ($name==root and $passwd==root and $value==3)

root加上引号试试