我想让用户使用用户名和密码登录，并且该数据是否与数据库中的用户名匹配。当我尝试时，我没有收到任何错误，但是没有用。我在Dreamweaver中使用html和php，在phpMyAdmin中使用WAM。我将同时包括表单文档和随附的php文档：
loginpage.php
<?php include('login.php'); // Includes Login Script if(isset($_SESSION['login_user'])){ header("location: index.php"); } ?> <table width="15px" border="0"> <form form action='login.php' method='POST'> <tr> <td>Username</td> <td><input type="text" name="username" /></td> </tr> <tr> <td>Password</td> <td><input type="password" name="password" /></td> </tr> <tr> <td><input type="submit" name="submit" value="submit"/></td> </tr> </form>
login.php
<html> <head> <title>Login</title> </head> <body> <?php session_start(); // Starting Session $error=''; // Variable To Store Error Message if (isset($_POST['submit'])) { if (empty($_POST['username']) || empty($_POST['password'])) { $error = "Username or Password is invalid"; } else { // Define $username and $password $username=$_POST['username']; $password=$_POST['password']; // Establishing Connection with Server by passing server_name, user_id and password as a parameter $hostname= "localhost"; $database = "boost"; $username = "root"; $password = ""; $localhost = mysqli_connect($hostname, $username, $password, $database); if(mysqli_connect_errno()) { die("Connection Failed".mysqli_error()); } // SQL query to fetch information of registerd users and finds user match. $sql = "SELECT * FROM `users`"; $query = mysqli_query($localhost,$sql); if(!$query) { die("Query Failed".mysqli_error($localhost)); } $rows = mysqli_num_rows($query); if ($rows == 1) { $_SESSION['login_user']=$username; // Initializing Session echo "You are now logged on!"; } else { $error = "Username or Password is invalid"; } mysqli_close($localhost); // Closing Connection } } ?> </body> </html>
此答案适用于hashing，password_hash（）和password_verify（）。对于mysqli和pdo。底部的链接具有其他链接以及有关盐等的某些语言。
至关重要的是不要将用户提供的数据直接用于选择和插入。而是绑定参数并调用准备好的语句，以避免sql注入攻击。永远不要将密码以明文形式保存在数据库中。而是应通过单向哈希发送它们。
另请注意。这显示了注册哈希和登录验证。它 不是完整的 功能，我想花10美元在codecanyon上用… …这样它表明电子邮件地址（登录名）的重新注册已经存在，确实更新了，请注意。在这种情况下，由于数据库中设置了唯一键，因此插入将完全失败。我将其留给读者（读者）进行查找，然后说“电子邮件已注册”。
CREATE TABLE `user_accounts2` ( `id` int(11) NOT NULL AUTO_INCREMENT, `email` varchar(100) NOT NULL, `password` varchar(255) NOT NULL, PRIMARY KEY (`id`), unique key(email) -- that better be the case ) ENGINE=InnoDB;
通过register.php运行并保存用户后，数据可能如下所示：
select * from user_accounts2; +----+-----------+--------------------------------------------------------------+ | id | email | password | +----+-----------+--------------------------------------------------------------+ | 1 | d@d.com | $2y$10$U6.WR.tiOIYNGDWddfT7kevJU8uiz8KAkdxXpda9e1xuplhC/eTJS | +----+-----------+--------------------------------------------------------------+
mysqli部分第一
<?php mysqli_report(MYSQLI_REPORT_ALL); error_reporting(E_ALL); // report all PHP errors ini_set("display_errors", 1); // display them session_start(); if(isset($_SESSION['userid'])!="") { // you are already logged in as session has been set header("Location: safe.php"); // note that this re-direct will at the top of that page // ... and there to verify the session state so no tricks can be performed // no tricks and gimmicks } if(isset($_POST['register'])) { $email = $_POST['email']; $ctPassword = $_POST['password']; // cleartext password from user $hp=password_hash($ctPassword,PASSWORD_DEFAULT); // hashed password using cleartext one // pretend the following is locked in a vault and loaded but hard coded here $host="yourhostname"; $dbname="dbname"; $user="dbuser"; $pwd="password"; $port=3306; // comes along for the ride so I don't need to look up param order below // end pretend try { $mysqli= new mysqli($host, $user, $pwd, $dbname,$port); if ($mysqli->connect_error) { die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error); } //echo "I am connected and feel happy.<br/>"; $query = "INSERT INTO user_accounts2(email,password) VALUES (?,?)"; $stmt = $mysqli->prepare($query); // note the 2 s's below, s is for string $stmt->bind_param("ss", $email,$hp); // never ever use non-sanitized user supplied data. Bind it $stmt->execute(); // password is saved as hashed, will be verified on login page with password_verify() $iLastInsertId=$mysqli->insert_id; // do something special with this (or not) // redirect to some login page (for now you just sit here) $stmt->close(); $mysqli->close(); } catch (mysqli_sql_exception $e) { throw $e; } } ?> <html> <head> <title>Register new user</title> </head> <body> <div id="reg-form"> <form method="post"> <table> <tr> <td><input type="email" name="email" placeholder="Email" required /></td> </tr> <tr> <td><input type="password" name="password" placeholder="Password" required /></td> </tr> <tr> <td><button type="submit" name="register">Register</button></td> </tr> <tr> <td><a href="index.php">Normal Login In Here</a></td> </tr> </table> </form> </div> </body> </html>
<?php mysqli_report(MYSQLI_REPORT_ALL); error_reporting(E_ALL); // report all PHP errors ini_set("display_errors", 1); // display them session_start(); if(isset($_SESSION['userid'])!="") { // you are already logged in as session has been set header("Location: safe.php"); // note that this re-direct will at the top of that page // ... and there to verify the session state so no tricks can be performed // no tricks and gimmicks } if(isset($_POST['login'])) { $email = $_POST['email']; $ctPassword = $_POST['password']; // cleartext password from user // pretend the following is locked in a vault and loaded but hard coded here $host="yourhostname"; $dbname="dbname"; $user="dbuser"; $pwd="password"; $port=3306; // comes along for the ride so I don't need to look up param order below // end pretend try { $mysqli= new mysqli($host, $user, $pwd, $dbname,$port); if ($mysqli->connect_error) { die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error); } //echo "I am connected and feel happy.<br/>"; $query = "select id,email,password from user_accounts2 where email=?"; $stmt = $mysqli->prepare($query); // note the "s" below, s is for string $stmt->bind_param("s", $email); // never ever use non-sanitized user supplied data. Bind it $stmt->execute(); $result = $stmt->get_result(); if ($row = $result->fetch_array(MYSQLI_ASSOC)) { $dbHashedPassword=$row['password']; if (password_verify($ctPassword,$dbHashedPassword)) { echo "right, userid="; $_SESSION['userid']=$row['id']; echo $_SESSION['userid']; // redirect to safe.php (note safeguards verbiage at top of this file about it) } else { echo "wrong"; // could be overkill here, but in logout.php // clear the $_SESSION['userid'] } } else { echo 'no such record'; } // remember, there is no iterating through rows, since there is 1 or 0 (email has a unique key) // also, hashes are one-way functions in the db. Once you hash and do the insert // there is pretty much no coming back to cleartext from the db with it. you just VERIFY it $stmt->close(); $mysqli->close(); } catch (mysqli_sql_exception $e) { throw $e; } } ?> <html> <head> <title>Login</title> </head> <body> <div id="reg-form"> <form method="post"> <table> <tr> <td><input type="email" name="email" placeholder="Email" required /></td> </tr> <tr> <td><input type="password" name="password" placeholder="Password" required /></td> </tr> <tr> <td><button type="submit" name="login">Login</button></td> </tr> </table> </form> </div> </body> </html>
下面的pdo部分
当我有时间时，大概是明天，但是现在我将您引向我的答案。
