if(isset($_POST['submit'])){
//Kiem tra du lieu nhap vao
if(empty($_POST['username']) || empty($_POST['email']) || empty($_POST['password']) || empty($_POST['confirm_password'])){
echo '
Vui long dien day du thong tin!
';
}else{
//Lay du lieu tu form
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];
$confirm_password = $_POST['confirm_password'];
//Kiem tra tinh hop le cua email
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
echo '
Email khong hop le!
';
}else{
//Kiem tra tinh hop le cua mat khau
if(strlen($password) < 6){
echo '
Mat khau phai co it nhat 6 ky tu!
';
}else{
//Kiem tra tinh trung khop cua mat khau
if($password != $confirm_password){
echo '
Mat khau khong khop!
';
}else{
//Ma hoa mat khau truoc khi luu vao co so du lieu
$password = md5($password);
//Ket noi den co so du lieu
$conn = mysqli_connect('localhost', 'root', '', 'bay789');
if(!$conn){
echo '
Khong the ket noi den co so du lieu!
';
}else{
//Kiem tra tinh ton tai cua ten dang nhap va email
$sql_check_username = "SELECT * FROM users WHERE username='$username'";
$sql_check_email = "SELECT * FROM users WHERE email='$email'";
$query_check_username = mysqli_query($conn, $sql_check_username);
$query_check_email = mysqli_query($conn, $sql_check_email);
if(mysqli_num_rows($query_check_username) > 0){
echo '
Ten dang nhap da ton tai!
';
}elseif(mysqli_num_rows($query_check_email) > 0){
echo '
Email da duoc su dung!
';
}else{
//Them nguoi dung moi vao co so du lieu
$sql_insert = "INSERT INTO users(username, email, password) VALUES ('$username', '$email', '$password')";
if(mysqli_query($conn, $sql_insert)){
echo '
Dang ky thanh cong!
Vui long
dang nhap de tiep tuc.
';
}else{
echo '
Dang ky khong thanh cong!
';
}
}
}
}
}
}
}
}
?>
