Question

我是PHP，HTML5和CSS的新手。我正在建立我的网站。 This是地址。当我点击 START FREE TRIAL 时，它意味着在数据库上注册用户并让他们访问网站上的其他页面。从那时起他们就登录了。问题是，当点击 START FREE TRIAL 时，用户可以访问其他页面，但我无法在数据库字段/列中看到注册通过Cpanel中的phpMyAdmin。据我所知，server.php（下面）连接到数据库服务器，这就是为什么要授予其他页面访问权限。

尝试登录时，框架内会出现错误对话框。下面的代码应该有效吗？或者我做错了什么？希望我已正确发布server.php。

<?php 
session_start();

// variable declaration
$fname = "";
$lname = "";
$username = "";
$email    = "";
$password = "";
$errors = array(); 
$_SESSION['success'] = "";

$dbh = mysqli_connect ("localhost", "usrname", "password")
or die ('I cannot connect to the database.');
mysqli_select_db ("db_name");




// REGISTER USER
if (isset($_POST['reg_user'])) {
    // receive all input values from the form
    $fname = mysqli_real_escape_string($dbh, $_POST['fname']);
    $lname = mysqli_real_escape_string($dbh, $_POST['lname']);
    $username = mysqli_real_escape_string($dbh, $_POST['username']);
    $email = mysqli_real_escape_string($dbh, $_POST['email']);
    $password_1 = mysqli_real_escape_string($dbh, $_POST['password_1']);
    $password_2 = mysqli_real_escape_string($dbh, $_POST['password_2']);

    // form validation: ensure that the form is correctly filled
    if (empty($fname)) { array_push($errors, "First Name is required"); }
    if (empty($lname)) { array_push($errors, "Last Name is required"); }
    if (empty($username)) { array_push($errors, "Username is required"); }
    if (empty($email)) { array_push($errors, "Email is required"); }
    if (empty($password_1)) { array_push($errors, "Password is required"); }

    if ($password_1 != $password_2) {
        array_push($errors, "The two passwords do not match");
    }

    // register user if there are no errors in the form
    if (count($errors) == 0) {
        $password = md5($password_1);//encrypt the password before saving in the database
        $query = "INSERT INTO users (fname, lname, username, email, password) 
                  VALUES('$fname','$lname', '$username', '$email', '$password')";
        mysqli_query($dbh, $query);

        $_SESSION['username'] = $username;
        $_SESSION['success'] = "You are now logged in";
        header('location: Continue.php');
    }

}

// ... 

// LOGIN USER
if (isset($_POST['login_user'])) {
    $username = mysqli_real_escape_string($dbh, $_POST['username']);
    $password = mysqli_real_escape_string($dbh, $_POST['password']);

    if (empty($username)) {
        array_push($errors, "Username is required");
    }
    if (empty($password)) {
        array_push($errors, "Password is required");
    }

    if (count($errors) == 0) {
        $password = md5($password);
        $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
        $results = mysqli_query($dbh, $query);

        if (mysqli_num_rows($results) == 1) {
            $_SESSION['username'] = $username;
            $_SESSION['success'] = "You are now logged in";
            header('location: Continue.php'); 
        }else {
            array_push($errors, "Wrong username/password combination");
        }
    }
}

Answer 1

感谢和WillParky93和Fred -ii指出了我正确的方向。这已通过更改此

解决

$dbh = mysqli_connect ("localhost", "usrname", "password")
or die ('I cannot connect to the database.');
mysqli_select_db ("db_name");

到

$dbh = mysqli_connect ("localhost", "usrname", "password")
or die ('I cannot connect to the database.');
mysqli_select_db ($dbh, "db_name");

注册和登录系统

1 个答案: