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server.php
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server.php
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<?php
session_start();
$username = "";
$email = "";
$errors = array();
$db = mysqli_connect('localhost', 'root', 'pass123', 'registration');
if (isset($_POST['register'])) {
if (isset($_POST['username'])) {
$username = mysqli_real_escape_string($db, $_POST['username']);
}
if (isset($_POST['email'])) {
$email = mysqli_real_escape_string($db, $_POST['email']);
}
$password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
$password_2 = mysqli_real_escape_string($db, $_POST['password_2']);
$q1 = "SELECT * FROM users WHERE username='$username'";
$q2 = "SELECT * FROM users WHERE email='$email'";
$r1 = mysqli_query($db, $q1);
$r2 = mysqli_query($db, $q2);
if (empty($username)) {
array_push($errors, "Username is required");
}
if (mysqli_num_rows($r1) > 0) {
array_push($errors, "Username is taken by some other user");
}
if (empty($email)) {
array_push($errors, "Email is required");
}
if (mysqli_num_rows($r2) > 0) {
array_push($errors, "Email is already registered, please login");
}
if (empty($password_1)) {
array_push($errors, "Password is required");
}
if ($password_1 != $password_2) {
array_push($errors, "The two passwords do not match");
}
if (count($errors) == 0) {
$password = md5($password_1);
$sql = "INSERT INTO users (username, email, password) VALUES ('$username', '$email', '$password')";
mysqli_query($db, $sql);
$_SESSION['username'] = $username;
$_SESSION['success'] = "You are now logged in";
header('location: index.php');
}
}
if (isset($_POST['login'])) {
if (isset($_POST['username'])) {
$username = mysqli_real_escape_string($db, $_POST['username']);
}
if (isset($_POST['password'])) {
$password = mysqli_real_escape_string($db, $_POST['password']);
}
// Ensure that form fields are filled properly
if (empty($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'";
$result = mysqli_query($db, $query);
if (mysqli_num_rows($result) == 1) {
$_SESSION['username'] = $username;
$_SESSION['success'] = "You are now logged in";
header('location: index.php');
exit();
} else {
array_push($errors, "Wrong username/password combination");
}
}
}
if (isset($_GET['logout'])) {
session_destroy();
unset($_SESSION['username']);
header('location: login.php');
}
?>