如何只为登录用户保护页面? [英] How do I protect a page only for logged users?
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问题描述
我创建了一个很好的登录表单.但是我意识到我的用户所指向的页面仍然可以被任何人访问.如何保护只有已登录用户才能访问的页面?
I created a login form that works great. But I realized the page my user is directed to can still be accessed by anybody. How do I protect the page being accessed only viewable by those logged in?
我需要在成功页面本身上放置一个脚本吗?
Do I need to place a script on the success page itself?
这是我的check_login.php:
Here is my check_login.php:
<?php
$host="localhost"; // Host name
$username="xxx"; // Mysql username
$password="xxx"; // Mysql password
$db_name="xxx"; // Database name
$tbl_name="xxx"; // Table name
// Connect to server and select database.
mysql_connect("$host", "$username", "$password") or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);
$count=mysql_num_rows($result);
$user_info = mysql_fetch_assoc($result);
if( isset($user_info['url']) ) {
session_register("myusername");
session_register("mypassword");
header('Location: ' . $user_info['url']); //Redirects to the supplied url from the DB
} else {
header("location:error.htm");
}
?>
推荐答案
您的每个页面都应以
session_start();
,从PHP 4.2版开始,您不应该使用session_register( "variablename" )
,请使用
and you should not be using session_register( "variablename" )
as of PHP version 4.2, use
$_SESSION["variable"] = value;
具有is-logged-it检查功能的示例页面为:
so example page with is-logged-it checking would be:
<?php
session_start();
if($_SESSION["loggedIn"] != true) {
echo("Access denied!");
exit();
}
echo("Enter my lord!");
?>
和登录脚本:
<?php
/*
... db stuff ...
*/
if( isset($user_info['url']) ) {
$_SESSION["loggedIn"] = true;
$_SESSION["username"] = $myusername;
header('Location: ' . $user_info['url']); //Redirects to the supplied url from the DB
} else {
header("Location: error.htm");
}
?>
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