Untitled

<?
session_start();

// HTML DESIGN
echo '<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
  <link rel="shortcut icon" href="assets/images/icon.png" type="image/x-icon">
  <meta name="description" content="">
  <link rel="stylesheet" href="assets/web/assets/mobirise-icons/mobirise-icons.css">
  <link rel="stylesheet" href="assets/tether/tether.min.css">
  <link rel="stylesheet" href="assets/bootstrap/css/bootstrap.min.css">
  <link rel="stylesheet" href="assets/bootstrap/css/bootstrap-grid.min.css">
  <link rel="stylesheet" href="assets/bootstrap/css/bootstrap-reboot.min.css">
  <link rel="stylesheet" href="assets/theme/css/style.css">
  <link rel="stylesheet" href="assets/mobirise/css/mbr-additional.css" type="text/css">
</head>
<body>
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
  <section class="header13 cid-r0UpWN5Ybq mbr-fullscreen mbr-parallax-background" id="header13-3">
    <div class="container">
</section></div>';

 // CHECK DB CONNECTION

$sql = new mysqli("localhost", "BCTFUSER", 'w~1=fh(,G+!Q', "BCTFDB");

if(mysqli_connect_errno()){

exit("Error in connection !");

}

 // GET POST VALUES

$username = mysqli_real_escape_string($sql, $_POST['username']);

$password = mysqli_real_escape_string($sql, $_POST['password']);

$email = mysqli_real_escape_string($sql, $_POST['email']);

 // CHECK EMAIL

$RGX = "/[a-zA-Z0-9_\-.+]+$@[a-zA-Z0-9-]+$.[a-zA-Z]+$/";

if (preg_match($RGX, $email) == false) {
  echo "<script type='text/javascript'>
swal('Error!','Do you know how to write your email ?', 'warning')
.then((value) => {
     location.href='index.php';
});
</script>";
}

 // CHECK SQL

$qe = $sql->query("SELECT * FROM users WHERE uname='$username' and upassword='password'");

if($qe->num_rows){

$_SESSION['US3RN4M3']= $username & "BCTFSESSION" & $password ;
echo "<script language='javascript' type='text/javascript'> location.href='index.php' </script>";

} else {

    echo "<script type='text/javascript'>
swal('Please check your username and password')
.then((value) => {
     location.href='index.php';
});
</script>";

}

?>