EDIT:: 首先为您自己的现有代码提供解决方案。应该可以正常工作。
<?php
session_start();
if(isset($_REQUEST['user'])) {
if(isset($_SESSION['uname']))
{
header('location:test.php?redirect='.$_SERVER['REQUEST_URI']);
exit;
}
// personalized page code
} else {
?>
<html>
<head>
<title>Welcome</title>
</head>
</html>
<body bgcolor="white">
<h1>Welcome</h1><br>
If you have an existing account, log in here:<br>
<form name="loginForm" action="test.php" method="get">
User name: <input type="text" name="user" /><br>
Password: <input type="password" name="pass" /></br>
<input type="submit" value="Login" />
</form>
<br>
<hr>
<br>
Otherwise, if you'd like to create an account, please fill out the following form:<br>
<form name="createAccountForm" action="test.php" method="get">
User name: <input type="text" name="user" /><br>
Password: <input type="password" name="pass" /><br>
First name: <input type="text" name="fname" /><br>
Last name: <input type="text" name="lname" /><br>
<input type="hidden" name="create" value="true">
<input type="submit" value="Create Account" />
</form>
</body>
</html>
<?php
}
?>
这是我自己的一个登录解决方案（删掉了一点通用性）它还包括用于数据库的 PDO 查询和使用 php 的 password_hash 函数检查密码的代码。我将指出与您的问题特别相关的代码：
假设您正在构建登录页面，并希望将用户发送到与他们的状态相关的站点的其他部分。我认为整个剧本是相关的。您可以轻松地交换和更改会话变量值所导致的结果。
<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
//start the session before sending any other output
session_start();
require('dbconn.php');
// checks if a session eid has been set, if so, send them to the usercp.
if(isset($_SESSION['eid'])){ header("Location: usercp.php"); } else {
try{
//build a login page
$loginpage ="<html><head><title>Portal Login</title></head><body>";
$loginpage.="<div align=\"center\" id=\"box\">";
$loginpage.="<table><tr><td><img src=\"images/login.jpg\" /></td></tr>";
$loginpage.="<tr><td><div align=\"center\">";
$loginpage.="<font face=\"Courier New, Courier, monospace\">Please enter your email<br /> address and password.</font><br />";
$loginpage.="<br /><form action=\"\" method=\"post\" name=\"login\" ><div align=\"right\">";
$loginpage.="<font face=\"Courier New, Courier, monospace\">Email:</font><input type=\"text\" size=\"40\" name=\"email\" />";
$loginpage.="<br /><br /><font face=\"Courier New, Courier, monospace\">Password:</font><input type=\"password\" size =\"40\" name=\"password\" />";
$loginpage.="<br /></div><br /><input type=\"reset\" value=\"Reset\" /> ";
$loginpage.=" <input name=\"submit\" type=\"submit\" value=\"Login!\" />";
$loginpage.="</form></div></td></tr></table></div></body></html>";
//checks if somebody is trying to login
if(isset($_POST['submit']))
//checks that the username and password have both been filled out if not, show the login page
{ if(!$_POST['email'] || !$_POST['password'])
{
echo $loginpage;
echo "Please enter your login details";
} else { //otherwise search the database for the email address
$db = NEW pdo($dsn, $db_user, $db_pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$email = $_POST['email'];
$password = $_POST['password'];
$check = $db->prepare("SELECT * FROM employees WHERE email = :email");
$check->bindParam(":email", $email);
$check->execute();
//unset the session variables
unset($_SESSION['eid']);
unset($_SESSION['email']);
unset($_SESSION['userlevel']);
unset($_SESSION['fname']);
//check if the password hash matches php's hash of the password
if(($row = $check->fetch()) && (password_verify($password,$row['password']))) {
// set the session variables
$_SESSION['eid'] = $row['eid'];
$_SESSION['email'] = $row['email'];
$_SESSION['userlevel'] = $row['userlevel'];
$_SESSION['fname'] = $row['fname'];
// if the user's userlevel is higher than 1 give them the option of the admin page
if($row['userlevel'] > "1") {
echo "<center><a href='usercp.php'><h1>User Panel</h1></a><br><br><a href='admin/admincp.php'><h1>Admin Panel</h1></a></center>";
} else { //otherwise send them straight to the usercp
header("Location: usercp.php");
}
} else { //if the email is not found or password is incorrect, show the loginpage again
echo $loginpage;
echo "Login details incorrect, please contact your manager.";
}
}
} else { //if nobody has logged in already, or tried to log in just now, show the login page
echo $loginpage;
}
//pdo error reporting code
} catch (PDOException $e) {
throw $e;
}
}
?>