Question

<?php

session_start();

// initializing variables
$username = "";
$email = "";

$errors = array();

// connect to db

$db = mysqli_connect('localhost','root','','login_db') or die("could not connect to database");

// register users

$username = mysqli_real_escape_string($db , $_POST['username']);
$email = mysqli_real_escape_string($db , $_POST['email']);
$password_1 = mysqli_real_escape_string($db , $_POST['password_1']);
$password_2 = mysqli_real_escape_string($db , $_POST['password_2']);

// form validation

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, "passwords do not match");}

// check db for existing with same username or email

$user_check_query = " SELECT * FROM userlogin WHERE username = '$username' OR email = '$email' LIMIT 1 ";

$results = mysqli_query($db , $user_check_query);
$user = mysqli_fetch_assoc($results);

if($user){

    if($user['username'] === $username) {array_push($errors, "username already exists");}
    if($user['email'] === $email) {array_push($errors, "email id is already registered");}
}

// register the user if no error

if(count($errors) == 0){

    //$password = md5($password_1) // this will encrypt the password
    $query = "INSERT INTO userlogin (username , password , email) VALUES ('$username' , '$password_1' , '$email')";

    mysqli_query($db , $query);
    $_SESSION['username'] = $username;
    $_SESSION['success'] = "you are now logged in";

    header(" location: home.php");
}


//login users

$username = mysqli_real_escape_string($db,$_POST['username']);
$password = mysqli_real_escape_string($db,$_POST['password_1']);

if(empty($username)){

    array_push($errors , "username is required");
}

if(empty($password_1)){

    array_push($errors, "password is required");
}

if(count($errors)==0){

    $query = "SELECT * FROM userlogin WHERE username = '$username' AND  password = '$password'";

    $results = mysqli_query($db,$query);


    if(mysqli_num_rows($results)){

        $_SESSION['username'] = $username;
        $_SESSION['success'] = "Logged in successfully";

        header('location: home.php');
    }
    else{
        array_push($errors, "Wrong username/password ");
    }
}
?>

注意：未定义的索引：第17行的C：\ xampp \ htdocs \ demo \ config.php中的用户名

注意：未定义索引：第18行中C：\ xampp \ htdocs \ demo \ config.php中的电子邮件

注意：未定义的索引：第19行的C：\ xampp \ htdocs \ demo \ config.php中的password_1

注意：未定义的索引：第20行的C：\ xampp \ htdocs \ demo \ config.php中的password_2

注意：未定义的变量：导致第34行的C：\ xampp \ htdocs \ demo \ config.php

警告：mysqli_fetch_assoc（）期望参数1为mysqli_result，在第34行的C：\ xampp \ htdocs \ demo \ config.php中给出空值

注意：未定义的索引：第59行的C：\ xampp \ htdocs \ demo \ config.php中的用户名

注意：未定义的索引：第60行的C：\ xampp \ htdocs \ demo \ config.php中的password_1

如何解决通知：未定义的索引：第17行的C：\ xampp \ htdocs \ demo \ config.php中的用户名？

0 个答案: