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server.php
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server.php
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<?php
session_start();
// initializing variables
$username = "";
$email = "";
$phone = "";
$errors = array();
// connect to the database
include('connect.php');
// REGISTER USER
if (isset($_POST['reg_user'])) {
// receive all input values from the form
$username = mysqli_real_escape_string($conn, $_POST['username']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$phone = mysqli_real_escape_string($conn, $_POST['phone']);
$password_1 = mysqli_real_escape_string($conn, $_POST['password_1']);
$password_2 = mysqli_real_escape_string($conn, $_POST['password_2']);
// form validation: ensure that the form is correctly filled ...
// by adding (array_push()) corresponding error unto $errors array
if (empty($username)) { array_push($errors, "Username is required!"); }
if (empty($email)) { array_push($errors, "Email is required!"); }
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { array_push($errors, "Invalid email!"); }
if (empty($password_1)) { array_push($errors, "Password is required!"); }
if ($password_1 != $password_2) {
array_push($errors, "The two passwords do not match!");
}
// first check the database to make sure
// a user does not already exist with the same username and/or email
$user_check_query = "SELECT * FROM registration WHERE username='$username' OR email='$email' LIMIT 1";
$result = mysqli_query($conn, $user_check_query);
$user = mysqli_fetch_assoc($result);
if ($user) { // if user exists
if ($user['username'] === $username) {
array_push($errors, "Username already exists!");
}
if ($user['email'] === $email) {
array_push($errors, "Email already exists!");
}
}
// Finally, 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
$query = "INSERT INTO registration (username, email, password, phone)
VALUES('$username', '$email', '$password', '$phone')";
mysqli_query($conn, $query);
$_SESSION['username'] = $username;
$_SESSION['success'] = "You are now logged in!";
header('location: index.php');
}
}
// LOGIN USER
if (isset($_POST['login_user'])) {
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);
if (empty($username)) {
array_push($errors, "Username is required!");
}
if (empty($password)) {
array_push($errors, "Password is required!");
}
if (count($errors) == 0) {
$password = md5($password);
$query = "SELECT * FROM registration WHERE username='$username' AND password='$password'";
$results = mysqli_query($conn, $query);
if (mysqli_num_rows($results) == 1) {
$_SESSION['username'] = $username;
$_SESSION['success'] = "You are now logged in";
header('location: index.php');
}else {
array_push($errors, "Wrong username-password combination!");
}
}
}
?>