我有一个logout.php链接，如果用户点击它，它应该会将他们注销
<?php
// logout.php
// you must start session before destroying it
session_start();
session_unset();
session_destroy();
//}
//echo "You have been successfully logged out.
?>
但是，当我返回login.php时，它会自动将它们重定向到login.php之后的登录页。以下是login.php的代码
<?php
// Connects to your Database
mysql_connect("localhost", "root", "") or die( mysql_error() );
mysql_select_db("sales") or die( mysql_error() );
//Checks if there is a login cookie
if( isset( $_COOKIE['ID_my_site'] ) ) {
//if there is, it logs you in and directes you to the members page
$username = $_COOKIE['ID_my_site'];
$pass = $_COOKIE['Key_my_site'];
$check = mysql_query("SELECT * FROM users WHERE username = '$username'") or die( mysql_error() );
while( $info = mysql_fetch_array( $check ) ) {
if ( $pass != $info['password'] ) {
} else {
header("Location: sales.php");
}
}
}
// if login is ok then we add a cookie
$_POST['username'] = stripslashes($_POST['username']);
$hour = time() + 3600;
setcookie( ID_my_site, $_POST['username'], $hour );
setcookie( Key_my_site, $_POST['pass'], $hour );
//then redirect them to the members area
header("Location: sales.php");
Cookies是会话，它们不是一回事（尽管后者通常由存储在cookie中的标识符支持）。
将用户名和密码存储在cookie中是个糟糕的主意。请改用$_SESSION。
cookies和session不同。Cookie存储在客户端的浏览器中，而会话存储在服务器中，这可能是您想要用来存储username和pass的（在您的情况下）。
如果你切换到使用会话，那么你的logout.php应该可以正常工作，但如果你想继续使用cookie，你应该在logout.php中使用以下内容：
setcookie('ID_my_site', '');
setcookie('Key_my_site', '');
<?php
// logout.php
// you must start session before destroying it
session_start();
session_unset();
session_destroy();
//}
//echo "You have been successfully logged out.
///to unet the cookie set it to a pas t time
setcookie ("ID_my_site", "", time() - 3600);
?>