PHP SESSION注销错误 [英] PHP SESSION Logout Error
问题描述
许多人可能将PHP mySQL函数用于网站的登录部分
Many people may use a PHP mySQL function for login sections for a website
我正在尝试使用此代码；
I am trying to use this code;
在每个内容页面上-检查是否已登录(在每个内容页面的标题中)
ON EACH CONTENT PAGE - TO CHECK IF LOGGED IN (in the header of every content page)
<?php
session_start();
if(! isset($_SESSION["myusername"]) ){
header("location:main_login.php");
}
?>
<html>
<body>
Page Content Here
</body>
</html>
登录脚本(由我的main_login.php页面引用)
THE LOGIN SCRIPT (which is referred to by my main_login.php page)
<?php
ob_start();
$host="ClubEvents.db.9606426.hostedresource.com"; // Host name
$username="ClubEventsRead"; // Mysql username
$password="Pa55word!"; // Mysql password
$db_name="ClubEvents"; // Database name
$tbl_name="members"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// Define $myusername and $mypassword
$myusername=$_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);
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_register("myusername");
session_register("mypassword");
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
ob_end_flush();
?>
注销代码
<?
session_start();
session_destroy();
header("location:main_login.php");
exit();
?>
MAIN_LOGIN.php
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="form1" method="post" action="checklogin.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="myusername" type="text" id="myusername"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="mypassword" type="text" id="mypassword"></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td><input type="submit" name="Submit" value="Login"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
<?php
phpinfo()
?>
但是某些东西不起作用，login_success.php页面仅在登录时才可访问，因此注销不起作用，或者login_success.php检查不起作用.但是我不知道该怎么说，我已经尝试过和他们俩一起玩，而且仍然没有前进的脚步
but something isnt working, the page login_success.php should only be accessable when logged in, so either the logout isnt working, or, the login_success.php check isnt working. But I don't know how to tell, I have tried playing around with them both, and still no further forward
致谢
亨利
推荐答案
我从未遇到以下问题:
unset($_SESSION[$myusername]);
这样做的好处是您只清除登录会话，并且可以根据需要自由地在会话中存储其他信息，因为session_destroy()会清除所有会话数据.
The advantage here is that you are only clearing the log in session and can freely store other information in the session if needed because session_destroy() will clear ALL session data.
还要查看您的代码，如果设置了用户名会话，它将始终将用户发送到登录页面.
Looking at your code as well, it's always sending the user to the login page if the username session is set.
更改:
<?php
session_start();
if( isset($_SESSION[$myusername]) ){
header("location:main_login.php");
}
?>
to(请注意isset之前的！).您只想在未设置会话的情况下重定向到登录页面.
to (notice the ! before isset). You only want to redirect to the login page when the session isn't set.
<?php
session_start();
if(! isset($_SESSION[$myusername]) ){
header("location:main_login.php");
}
?>
评论摘要:
Session[$myusername]更改为Session['myusername']，并且isset检查更改为!isset.这表明该会话不是最初设置的.
Session[$myusername] changed to Session['myusername'] and the isset check was changed to !isset. This identified the session wasn't being set in the first place.
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