如何让用户只删除他们的详细信息而没有其他人的php
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【中文标题】如何让用户只删除他们的详细信息而没有其他人的php【英文标题】：How to let user only delete their details and no one elses php 【发布时间】：2022-01-13 10:03:59 【问题描述】：我创建了一个非常基本的网站，用户可以在其中登录，然后可以访问他们可以编辑的表格。我希望用户只能删除他们自己的详细信息而不能删除其他人，而且我不知道我应该在删除页面中添加什么，所以它只会删除登录用户的详细信息而不删除别人的。目前它不会删除任何细节。
这是我的注册页面
<?php
// Include config file
require_once "pconfig.php";
// Define variables and initialize with empty values
$username = $password = $confirm_password = "";
$username_err = $password_err = $confirm_password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST")
// Validate username
if(empty(trim($_POST["username"])))
$username_err = "Please enter a username.";
elseif(!preg_match('/^[a-zA-Z0-9_]+$/', trim($_POST["username"])))
$username_err = "Username can only contain letters, numbers, and underscores.";
else
// Prepare a select statement
$sql = "SELECT id FROM users WHERE username = ?";
if($stmt = mysqli_prepare($link, $sql))
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_username);
// Set parameters
$param_username = trim($_POST["username"]);
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt))
/* store result */
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt) == 1)
$username_err = "This username is already taken.";
else
$username = trim($_POST["username"]);
else
echo "Oops! Something went wrong. Please try again later.";
// Close statement
mysqli_stmt_close($stmt);
// Validate password
if(empty(trim($_POST["password"])))
$password_err = "Please enter a password.";
elseif(strlen(trim($_POST["password"])) < 6)
$password_err = "Password must have atleast 6 characters.";
else
$password = trim($_POST["password"]);
// Validate confirm password
if(empty(trim($_POST["confirm_password"])))
$confirm_password_err = "Please confirm password.";
else
$confirm_password = trim($_POST["confirm_password"]);
if(empty($password_err) && ($password != $confirm_password))
$confirm_password_err = "Password did not match.";
// Check input errors before inserting in database
if(empty($username_err) && empty($password_err) && empty($confirm_password_err))
// Prepare an insert statement
$sql = "INSERT INTO users (username, password) VALUES (?, ?)";
if($stmt = mysqli_prepare($link, $sql))
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ss", $param_username, $param_password);
// Set parameters
$param_username = $username;
$param_password = password_hash($password, PASSWORD_DEFAULT); // Creates a password hash
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt))
// Redirect to login page
header("location: plogin.php");
else
echo "Oops! Something went wrong. Please try again later.";
// Close statement
mysqli_stmt_close($stmt);
// Close connection
mysqli_close($link);
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sign Up</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<style>
body font: 14px sans-serif;
.wrapper width: 360px; padding: 20px;
</style>
</head>
<body>
<div class="wrapper">
<h2>Sign Up</h2>
<p>Please fill this form to create an account.</p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group">
<label>Username</label>
<input type="text" name="username" class="form-control <?php echo (!empty($username_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $username; ?>">
<span class="invalid-feedback"><?php echo $username_err; ?></span>
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" class="form-control <?php echo (!empty($password_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $password; ?>">
<span class="invalid-feedback"><?php echo $password_err; ?></span>
</div>
<div class="form-group">
<label>Confirm Password</label>
<input type="password" name="confirm_password" class="form-control <?php echo (!empty($confirm_password_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $confirm_password; ?>">
<span class="invalid-feedback"><?php echo $confirm_password_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit">
<input type="reset" class="btn btn-secondary ml-2" value="Reset">
</div>
<p>Already have an account? <a href="plogin.php">Login here</a>.</p>
</form>
</div>
这是我的登录页面
<?php
// Initialize the session
session_start();
// Check if the user is already logged in, if yes then redirect him to welcome page
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true)
header("location: allcontacts.php");
exit;
// Include config file
require_once "pconfig.php";
// Define variables and initialize with empty values
$username = $password = "";
$username_err = $password_err = $login_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST")
// Check if username is empty
if(empty(trim($_POST["username"])))
$username_err = "Please enter username.";
else
$username = trim($_POST["username"]);
// Check if password is empty
if(empty(trim($_POST["password"])))
$password_err = "Please enter your password.";
else
$password = trim($_POST["password"]);
// Validate credentials
if(empty($username_err) && empty($password_err))
// Prepare a select statement
$sql = "SELECT id, username, password FROM users WHERE username = ?";
if($stmt = mysqli_prepare($link, $sql))
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_username);
// Set parameters
$param_username = $username;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt))
// Store result
mysqli_stmt_store_result($stmt);
// Check if username exists, if yes then verify password
if(mysqli_stmt_num_rows($stmt) == 1)
// Bind result variables
mysqli_stmt_bind_result($stmt, $id, $username, $hashed_password);
if(mysqli_stmt_fetch($stmt))
if(password_verify($password, $hashed_password))
// Password is correct, so start a new session
session_start();
// Store data in session variables
$_SESSION["loggedin"] = true;
$_SESSION["id"] = $id;
$_SESSION["username"] = $username;
// Redirect user to welcome page
header("location: allcontacts.php");
else
// Password is not valid, display a generic error message
$login_err = "Invalid username or password.";
else
// Username doesn't exist, display a generic error message
$login_err = "Invalid username or password.";
else
echo "Oops! Something went wrong. Please try again later.";
// Close statement
mysqli_stmt_close($stmt);
// Close connection
mysqli_close($link);
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<style>
body font: 14px sans-serif;
.wrapper width: 360px; padding: 20px;
</style>
</head>
<body>
<div class="wrapper">
<h2>Login</h2>
<p>Please fill in your credentials to login.</p>
<?php
if(!empty($login_err))
echo '<div class="alert alert-danger">' . $login_err . '</div>';
?>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group">
<label>Username</label>
<input type="text" name="username" class="form-control <?php echo (!empty($username_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $username; ?>">
<span class="invalid-feedback"><?php echo $username_err; ?></span>
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" class="form-control <?php echo (!empty($password_err)) ? 'is-invalid' : ''; ?>">
<span class="invalid-feedback"><?php echo $password_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Login">
</div>
<p>Don't have an account? <a href="pregister.php">Sign up now</a>.</p>
</form>
</div>
</body>
</html>
这是我的联系页面
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Display Contacts</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<style>
body font: 14px sans-serif;
.wrapper width: 360px; padding: 20px;
</style>
</head>
<body>
<!DOCTYPE html>
<html>
<head>
<title>Display all records from Database</title>
</head>
<body>
<h2>Users</h2>
<table border="2">
<tr>
<td>Sr.No.</td>
<td>Full Name</td>
<td>Password</td>
<td>Edit</td>
<td>Delete</td>
</tr>
<?php
include "pconfig.php"; // Using database connection file here
$records = mysqli_query($link,"select * from users"); // fetch data from database
while($data = mysqli_fetch_array($records))
?>
<tr>
<td><?php echo $data['id']; ?></td>
<td><?php echo $data['username']; ?></td>
<td><?php echo $data['password']; ?></td>
<td><a href="edit.php?id=<?php echo $data['id']; ?>">Edit</a></td>
<td><a href="delete.php?id=<?php echo $data['id']; ?>">Delete</a></td>
</tr>
<?php
?>
</table>
</body>
</html>
最后是我的删除页面
<?php
include "pconfig.php"; // Using database connection file here
$id = $_GET['id']; // get id through query string
if($param_username == "$id")
$del = mysqli_query($link,"delete from users where id = '$id'"); // delete query
mysqli_close($link); // Close connection
header("location:allcontacts.php"); // redirects to all records page
exit;
else
echo "Error deleting record"; // display error message if not delete
?>
【问题讨论】：
请仅提供必要的最少代码来澄清您的问题。没有人会读到这一切…… 是的，代码有点太多了。但它让我看到您将用户 ID 存储在会话中。您应该使用它来删除属于该用户的数据，而不是作为 URL 参数给出的用户 ID。// Password is correct, so start a new session session_start(); 实际上会在日志中生成警告，说明会话已经开始，然后重新使用会话。但我不认为这实际上是一个问题
【参考方案1】：
<?php
session_start();
include "pconfig.php"; // Using database connection file here
$id = $_GET['id']; // get id through query string
if($_SESSION["id"]!==$id)// display error message if user is not same
echo "You need to delete your own record";
exit;
$del = mysqli_query($link,"delete from users where id = '$id'"); // delete query
mysqli_close($link); // Close connection
header("location:allcontacts.php"); // redirects to all records page
exit;
?>
你需要在删除页面的上面添加session_start()函数
使用您在登录页面中指定的 $_SESSION["id"] 会话 在执行任何操作之前始终检查/比较逻辑，这样您的代码将保持小巧、智能、简单、可读和快速。【讨论】：
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