Php session 不工作

Question

我正在尝试使用 session 来确定用户是否已登录。人们不能再使用 url 来登录，他们将重定向到 mainlogin.html，但现在如果我输入正确的登录详细信息我会被重定向回 mainlogin.html，如果我输入了错误的详细信息，它会通知我。我希望这不是重复的。我查看了整个表格并尝试了其他人的方法，但它们对我不起作用。

checklogin.php

<?php 
session_start(); 
ob_start();

$host="foo"; // Host name 
$username="bar"; // Mysql username 
$password=""; // Mysql password 
$db_name="foo";// Database name 
$tbl_name="bar"; // Table name 

mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");


$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword']; 


$mypassword= sha1($mypassword);
$myusername = stripslashes($myusername);
$mypassword = stripslashes ($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE myusername='$myusername' and    mypassword='$mypassword'";
$result=mysql_query($sql);


$count=mysql_num_rows($result);

if($count==1) {

    $_SESSION['myusername'] = $$myusername;
    $_SESSION['mypassword'] = $$mypassword;

    header("location:login_success.php");
}
else {
    //header('Location: ../mainlogin.html');
    echo "Wrong Username or Password";
}
?><? ob_flush(); ?>

login_success.php

<?php
session_start();
// Check, if username session is NOT set then this page will jump to login page

if (!isset($_SESSION['myusername'])) {
    header('Location: ../mainlogin.html');
}
exit;
?>

Answer 1

美元符号太多？

$_SESSION['myusername'] = $$myusername;$_SESSION['mypassword'] = $$mypassword;  ...      

应该是

$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword'] = $mypassword;

..ops.. 将密码存储在 session 中不是一个好主意.. 最好按照教程说的做

session_register("myusername");
session_register("mypassword");